bucking after TB install

[quik50]

i hope someone can help me. i just installed a 70mm pro. products TB on my 89 lx, and now either under acceleration or in 5th at round 1800rpm is bucks. under acceleration it is pretty rough. i have checked for vaccume leaks, and all other connections, and everything seems to be fine. now i have not installed the EGR plate yet so i am still running the stock one. i am also gettin a check engine light that flashes on and off every now and then. i will be gettin tha checked out here in a few mins. just wanted to check with you guys first to see if yall had any ideas. thanks ahead of time!!

 

[86bluecobra]

are all the volt measure ments ok? any chance the TPS got screwed up. you can round the holes of them to adjust the volt reading to the computer if you have 2.

 

[quik50]

yea i checked that too. and readjusted it. it says its suppose to be between .90-.95v it is set a .926v. when i first put it on it run fine.(that was last fri.) it started runnin funny sat. nite on my way hm. so today i took everything off checked gaskets, re-checked the TPS voltage, and everything seemed fine. really weird problem!

 

[Strype]

hmmmmm... do you have a way of checking the Fuel Pressure- I put a phenolic spacer on one of my cars and it threw the Fuel Pressure off and it started bucking... I also found bad vacuum lines at the same time though. My money would be on Vacuum Leak or Fuel Pressure. Good Luck Mang!

 

[quik50]

think is was bad gas guys! i let a buddy of mine drive it roundfor like 15miles and it never bucked once. i just put some new 93+114 in it. and the check eng. lite has not been on either. thanks for ur input though:SNSign:

 

[Shakerhood]

I dont know all your Mods, but a 70mm T/B is a little on the Big Side for a near stock engine, a 65mm would probably be a better choice.

 

[quik50]

a 70 is a lil too big...i will agree with you on that one. i have a trickflow track heat upper/lower on the way and a 75mm mass.air w/24lb injectors. i just wanted to put on what i already had in my hands. you know what its like to have new parts, cant wait to put them on.
my car is mostly stock, it is a 306 with speed pro forged pistons, stock cam and heads, stock intake. bbk equal lenghts, mac h-pipe and two chamber flowmasters. and a 3:73 gear. its a good start though.