the car is a 1991 toyota corolla dx been running great till a few days ago.
had 135,000 miles, automatic, very nice car. well kept.
it started to hesitate during acceleration and then bog down.
thought it was fuel or water in fuel so put heat in tank, no change
checked plugs wires, made sure everything was plugged in, no cracks, leaks etc. found nothing
idles fine cold, runs smooth, once warm engine stumbles and has rough idle.
when going down road, car runs ok as long as i dont mash the gas or need to accelerate fast. if i do push the gas down it hesitates then bogs down and is slow to accelerate.
i have replaced the PCV and grommet, car running improved slightly, cleaned idle air control valve, car improved again but still same issues.
i am at my wits end, no check engine light, and there are no codes to be pulled. i have check the systems and cant find anything wrong.
if its cold outside like below 40, car starts up idles fine, but once i get on road out of drive way and hit gas to go, its starts stumbling again.
if its warm out car idle is rough and problems on road are same.
i am very open to suggestions, or ideas of what this is and how to fix it.
i lurk often on these forums but have never registered.