WHEN COLD (AT START UP) THE CAR PULLS AWESOME THEN ONCE IT WARMS UP IT FEELS LIKE IT ALMOST DEVELOPS A MISS, I CHECKED ALL THE PLUGS AND WIRES THEY LOOK GOOD INSTALLED NEW PLUGS, NEW COIL, IT IDLES PERFECTLY THEN WHEN IT HAS LOAD ON IT IT LIKE "PULSES OR BUCK UNDER MEDIUM THROTTLE. WITH LIGHT THROTTLE IT RUNS SMOOTH AND PULLS SMOOTH YOU CAN EVEN PICK UP THE PULSING THROUGH THE EXHAUST TONE. I MONITORED IT WITH MY SCAN MASTER AND THE ONLY THING THAT LOOKS MAYBE ABNORMAL IS THE IAC IS AT 35-40 AT IDLE ANY HELP PLEASE !!!

 

did you check the fuel pressure?

 

Sounds like the opti, dude....

 

If the FP checks out I would say Opti as well.

My car is doing the same thing.

 

FUEL PRESSURE IS 41 AT IDLE GOES TO 50 AT WOT.... IF IT WAS THE OPTI WOULDN'T IT GO SLOWLY IT RAN PERFECT THEN ALL OF A SUDDEN BANG... COULD THE MSD HAVE CAUSED THIS ... I'LL TRY TO ELIMINATE IT OU OF THE LOOP

 

I DID A SEARCH AND FOR THIS CONDITION EVERYONE ALWAYS SAYS OPTI FIRST AND FORMOST BUT NO ONE EVEER CONFIRMS THAT THE OPTI WAS THEIR PROBLEM I JUST DON'T WANT TO CHANGE THE OPTI AND THE CONDITION STILL LINGER THEN I'LL BE REALLY UPSET

 

just to update everyone and close this thread. i ran the car at night to check for arching there was none. the i checked alll the heat sheilds on the plugs thinking they maybe grounding out but they were cool to. while pulling the boots off iwas feeling the plugs and #7 felt loose! so i put a socket on it and it wasn't so i took it out and the porcelin was cracked!!! i must have cracked it putting it in !!! i just wanted to post the fix wich no one ever really does and say maybe it's not allways the opti like everyone suspects when anything goes wrong. check all option first.

 

you also turned the caps lock off, lol... Hurrah!!!

 

I have posted saying "it was NOT the opty". Had a sparkplug failure (porcelain insert cracked) and had a similar problem to yours. My opty is a dinosaur and keeps going and going.


I suspected my opty but when I found out it was not... I posted immediately for the next spark plug victim to save cash while fixin his/her problem


Marvin

 

thanks mental i did a search when the prob arose but found a lot of open threads and got discouraged. please keep posting when you fix your problems and i'm going to also so everyone here can save time abd money thanks again