I have a 94 GSR with I/H/E "free flow cat" ,FPR at 40, and timing at 18 degres. THe problem with the car is it sometimes drops like 50-100 rpm while I'm driving. It will do it every 30-60sec for a couple minutes and then stop. It does it with the cruise control on to and its very annoying. It feels kinda like I let the clutch out to fast.

SO far Ive replaced the fuel filter and plugs with no luck. Any ideas?

 

nobody?

 

it could be a leak. check somewhere behind the intake manifold. im not sure of the technical name, but its a hose behind the intake man. or tps???

 

Do you get any codes?

How's the rest of the ignition (wires, cap, rotor)?

Does the tach bounce funny or does it just smoothly follow the engine speed when it loses power? Since it's a GS-R it must have a manual tranny; the car's momentum will keep the 'true' engine speed up.

 

I replaced all of the vacum hoses and the problem was still there. DOn't know about the TPS.

The problem only happens probably once a week while I'm driving. The car came with Neuspeed wires, I don't know if they are a problem . Haven't tried the rotor yet.