OK guys, i'v been reading here for a while. A few months back i bought a formula (95) 6spd car not running. It had new heads, and mild cam swap just before i bought it. I put a new opti, maf sensor and tps sensor on. For the first few days the car ran stong. Now there is a stumble when u mash the gas. If u ease it through the gears it is not noticible. It also doesn't do it as bad when the motor is cold. it is most noticible when your in say 4th gear at 35mph and try to accelerate. feels like a fuel problem. car has no codes. Car sat for two years not running until i bought it. What dp u guys think?

 

Well, if it feels like a fuel problem, it's probably a fuel problem.

Based on your description, the first thing I'd check is the fuel filter.

To be thorough, put a new set of plugs and wires on it too.

 

mine acted similarly when the coil went out. toss on a fuel pressure gauge and check that.

 

spark plugs
wires
icm
coil
change fuel filter
check fuel press

 

O2 sensors, fuel filter or ICM.