Slight Stutter And Inconsistent Throttle

[David836]

I have a 92/93 R32 gts-t manual. The throttle isn't 100% smooth or consent. When I am cruising the engine seems to drop or hesitate as if a coil failing. When I slightly press the accelerator, it will pick up faster then it should. These issues seem to be only when I am at the first 5% of the throttle, when I am cruising and it does not seem to be temp orientated; however, it is slightly worse when the car is cold. Along with these issues the car starts like a pig first thing in the morning or after an extended period. It requires turning over several times before idling up other wise it idles out as if its not getting fuel. Prior to a year ago the car was very easy to start. I have already purchased with in the past 6 months several parts, these include:

• New Splitfire Coils
• New ignition harness
• Platinum plugs
• An ignition module
• Several second hand IAC valves
• A temp sensor
• MAF
• New fuel regulator

I have checked all the vacuum hoses and replaced one. The car is for the most part stock. It does have a 6in HKS pod and a custom turbo back stainless steel exhaust. I am some what at an end to what I can check without out-laying lots of money for new and expensive parts. Other then the said issues the car runs great, there are no misfires, it idles perfectly and accelerates hard to the red line. It may seem like a small issue/s but driving it as an every day car, this gets very frustrating!

[Ben C34]

Sounds like it could be a vacuum leak. pressure test to find leaks.

[David836]

Sounds like a plan. I am no expert in cars so other than taking each vacuum pipe off and testing it how would I check them?

[Ben C34]

search how to do a prssure test. or you can spray aerostart or simmilar all over the place. there's plenty of info on the net to find vaccuum or boost leaks

[AngryRB]

Maybe check the TPS is set correctly and possibly a fluctuating voltage from the alternator.. I had this sort of issue and never found the exact cause but i know the alternator was acting weird and tuner said the TPS needed adjustment so it wouldn't have be so sensitive to light throttle...