What is causing my motor's RPM to sputter once at a red light?

Question

I have a 98 prelude.. It idles fine but when the car warms up and you drive for about 10-20 min then when you stop at a stop light for more then a min. the motor wll almost shut off but then go back to normal right away.. this only happens when i stop for more then one min. and it only happens once every stop that's more then a min.

(((You might want to check the idle air controller, the mass air flow sensor, the timing, the ignition coil, the air filter, or the spark plugs)))

I cleaned IAC and I replaced the coil and spark plugs and wires and timming belt .. The prelude does not have a Mass air flow sensor..

I don't think it's the fuel pump.. it does it regardless if the tank is full or not.. Actually I was thinking about the TPS but as another issue.. ( when accelerating in 2nd gear the car seems to sputter a bit) will disconnecting the TPS help me figure it out..?

Answer 1

You might want to check the idle air controller, the mass air flow sensor, the timing, the ignition coil, the air filter, or the spark plugs.

When the engine stumbles like that, it means the engine is misfiring. Any one of those things can cause the engine to misfire or stumble.

Most cars will start to idle at about 1,000 rpms, but after the car has been idling for a bit of time, it will drop down to somewhere between 500 and 750 rpms.

Your car might be misfiring when it goes to drop down to the lower idle speed. Any one of those things might cause that.

Answer 2

Bad tps...Throttle position sensor. The only other thing that causes that exact sypmtom is the fuel pump. Is your tank full when this happens? If not then you may have a broken pickup tube in the gas tank and the gas sloshing around when you come to a stop could be missing the pick up tube till the fuel settles