As titled, car gives a hesitation under load @ roughly 3800-4000. It doesn't care on how much throttle, does it with mild to wot. No codes, mil light doesn't come on. Low rpm power suffers @ 12 degree timing, have it set at 16.

Car has-
gt40 intake
190cc runner aluminum heads
30lb injectors with matching c&l tube
bored .030 over
E303 cam


Any clues to the culprit???

 

Im having the same issue, pretty sure all my mallory stuff took a **** and is causing it.

 

it was worse with the stock tfi distributor, replaced it with a mallory. should I put the stock unit back on with a new module??

 

The ignition might not be your problem, clean your MAF sensor and see what happens.

 

How do you clean the maf? Its a big tube with a calibration tube. 73mm maf.

 

go to the parts store and buy a can of maf cleaner

 

Cleaned maf, no dice. checked voltage on TPS and it was too high. 1.2/1.3 volts. I pulled out the throttle screw and now it won't start. I reset timing to 12 degrees and is hard to start. if I set timing to 18 degrees, it starts, revs but surges after a while. would hate to sell due unresolvable issues.