Motor missing under load

[Gtwo]

My 98 stick car is missing real bad under load and once it starts it won't quit till you shut the motor off and restart it,then it runs like a raped ape. For a minute anyway then it goes right back to its trick.
Kinda acts like its running outta gas, it does have the o2 sensors disconnected when the cats got Removed, any ideas,I got a fuel filter to put on tomorrow, hope it helps.

 

[brtnstrns]

I was gonna say O2 sensors. Any chance it isn't tuned correctly for having them disconnected?

 

[Gtwo]

Just bought the car and really have no idea what its got. It does have a cai, headers and 3" straight pipes with flowmasters, was told it has a cobra intake,and a " stage 2" chip?
Plus bigger injectors, but not sure how to be sure.

Which tuners allows me to "turn off" the o2 sensors?

A local yokel says its the camshaft position sensor?

Would a failing fuel pump act this way?

I thought maybe the pump was sucking something up and when you shut the car off it loses suction and drops it back down. Or a hose pinching flat, is it hardline all the way down to the sock or is there any rubber line between the sock and pump?

 

[trombonedemon]

Start doing some tests.

You can check the fuel injectors by what color they are. Use the search function provided.

Are you throwing any codes or have any stored? Get a OBD2 reader or go to Auto-Zone.

My instinct tells me that the Cobra lower intakes don't fit a two valve, the heads have to be swapped over, somebody correct me if I'm wrong.

Check fuel pressure. Check spark-plug wells and check spark plugs for coolant. Check cylinder head compression. Check gaskets for leaking coolant and the plastic coolant crossover.

Could be a lot of things that are wrong. Sometimes symptoms are the same for failing car parts.

 

[Gtwo]

This is what the top end looks like.

 

[SROBERTLAW2003]

did you buy this car from a guy out of scottsboro alabama?

 

[Gtwo]

No,came out of south Florida.

Drove all day today with never a sputter one,didn't get enough downtime to change the filter,but for sure in the morning. Want to get this bug out so I can put my spray on it.

 

[trombonedemon]

You have the 19lb fuel injectors.

 

[Gtwo]

Ok,put New filter on, kinda brownish looking gas coming out of it, runs clear in the line though.

Fuel pump is getting replaced for good measure, its already making some weird noises, not gonna wait for it to leave me stranded.

My next question is this, I have the 98 gt with a return line. It just has gears,lt and full exhaust with a cai for now, but cams and no2 are in its future. What fuel pump is the cheapest that is up to the task, is the walbro 255 the right pump for my application? Any suggestions would be greatly appreciated.

 

[AZmustang98]

I think other than SVT Focus pumps and some other OEM Ford pumps. The Walbro is the only "aftermarket" pump and it flows 255...

Correct me if im wrong.

 

[Gtwo]

Got these codes

P0340

P1150

P1151

P1152

P0420

 

[OonDeanisS]

did you resolve this issue? i have a similar problem on my 1990 5.0.

 

[98gtDan]

P0340 is the Camshaft Position Sensor and are around 15 dollars.
the rest are from the lack ok o2 and cats.

 

[OonDeanisS]

and i quote, from LRS... "Some symptoms of your Mustang's camshaft position sensor failing are: engine dying at random, check engine light coming on, engine will turn over but not start, dying at stops, or the engine will crank but will not start back up."

 

[Gtwo]

This seemed to fix it.

 

[evolucion311]

 

[OonDeanisS]