I have a 2000 Civic Si and im having hesitation when driving. What happens is when im driving chill the car feels like i have let off the gas pedel then step on it again. The RPMs drop slow then pick up quick out of nowhere. I've changed the Fuel pump and filter, Spark plugs and the TPS and still nothing. please help

 

Also inspect/replace the distributor cap and rotor.

 

i recommend cleaning you iacv. tht sounds like the problem i had with the same motor.

 

Any CEL's?

Make sure the TPS is at the right voltage, and also I would highly recommend checking out what the other two guys said on here also, being the Distributor, and IACV

 

I have replaced the Cap n Rotor 3 times... And i cleaned out the IACV with Electrical cleaner and still doing the same. =[

 

Naw no CELs.

 

Hmm, Hesitation could be a sign of a bad clutch--Depending on when it hesitates and how it hesitates.

How is your car shifting?

Is there any rocking, or sputtering when the car shifts, or when you're driving?

 

naw everythings feels just right. I mean the clutch doesnt slip. The RPMs just drop like if i were letting go of the gas pedel

 

How old are the plug wires? Have checked the ignition timing with a timing gun?

 

make sure your TPS and map sensors are working proporly, i forgot yo plug in my TPS one time and it did the same thing