jerking at low RPMS...

[genericstang]

today when i was out driving and slowing down my 88 5.0 (5spd) it started jerking. i was in second and starting to come to a stop. it doesnt do it in any other gear except a little bit in 3rd. and it only does it when slowing down.

i also noticed that it almost feels like the throttle is getting stuck when im accelerating. i dont think its the clutch slipping,(doesnt feel like it at least) its like a "hesitation" after depressing the accelerator.

it has not done this before ever. anyone have any ideas?

 

[genericstang]

bump

 

[Dean85GT]

so when you have your foot on the brake your foot is not on the clutch?

 

[1991vert]

are you serious? low rpm's with the car still in gear coming to a stop will ALWAYS result in bucking/jerking. why even downshift when coming to a stop? just put the car in neutral. car was going to slow to be in that gear. bucking/jerking when coming to a stop will result in stalling out if you dont put your foot in on the clutch. common sense.

correct me if i misunderstood what you originally said.

 

[genericstang]

no, i think i confused everyone. i know it will buck and jerk if im slowing down in low gear etc. let me see if i can explain this better.

ok lets see here...

for example i was going through the parking lot at about 2K RPM and in second gear and just on the gas a little and it jerks like crazy. and thats never happend before at all.

also in addition to what i posted above, when i first turn on the car on now the RPMs fluctuate from like 550-1000 like 4-5 times then settles out at normal RPM range(around 800 or so, give or take some). this is starting to frustrate me.

anyone have any idea now?

 

[89lxsport50]

Pull the codes. Check alternator output. How old is the fuel filter?

 

[Stang8URMPRT]

If you MUST jerk it in your car... I guess doing it at low RPMs is best?

 

[genericstang]

If you MUST jerk it in your car... I guess doing it at low RPMs is best?

i knew this was cumming. ANYWAYS...


ill check the codes. i got a buddy with a reader. i thought maybe it could be the alternator(dont know if its ever been replaced/serviced in the 132K miles that are on the car). i will also check out the fuel filter, i dont think that has been changed either. anyways, thanks for the helping everyone.

keep the posts coming

 

[Slo 5.0]

If you MUST jerk it in your car... I guess doing it at low RPMs is best?

​

 

[illwood]

But seriously, is this just when it's cold? EGR valve maybe.

 

[genericstang]

But seriously, is this just when it's cold? EGR valve maybe.

no, it did it throughout the day when i was running arrands. so i dont know? i checked around the engine bay, didnt see anything loose or anything. hmm.

 

[50gt1988]

I had the same problem with my 88gt when I would start it the rpms would jump around about 4 or 5 times before it evened out, I replaced the idle control valve and it fixed the problem.

 

[genericstang]

I had the same problem with my 88gt when I would start it the rpms would jump around about 4 or 5 times before it evened out, I replaced the idle control valve and it fixed the problem.

how much do they run? is it an easy install? thanks for your help!

 

[neikoblu]

I know that it will do it in my car but I think that it is just my cam. 513 lift 298 dur.

 

[genericstang]

would it be called(this is at Autozone) a...

IDLE AIR CONTROL VALVE or

IDLE SPEED CONTROL ACTUATOR

 

[50gt1988]

Its the long cylinder on the side of the throttle body, 2 bolts and a plug. I can't remember what i paid for the new part but I think it was around 40$.

 

[50gt1988]

would it be called(this is at Autozone) a...

IDLE AIR CONTROL VALVE or

IDLE SPEED CONTROL ACTUATOR

IDLE AIR CONTROL VALVE<-------

 

[88_GT_5_oh]

EXACT same problem i had last summer... it was the TPS sensor. bought a new one and it went away completly

 

[genericstang]

so its either, the...

-Idle Air Control Valve
-Throttle Position Sensor

or possibly, the PCV (i dont think it has been changed either). i think ill start with this and then work with the others if this doesnt work.

thanks again for everyone's continued help.

 

[88_GT_5_oh]

edit.......shoulda read the post above me better