try changing the distributor cap , Faulty emissions system components , Low or uneven cylinder compression pressures , weak or faulty ignition system , ( Vacuum leaks at the throttle body, intake manifold or vacuum hoses . spark plugs incorrectly gapped ? check the spark plug cables..if they're not in a specific order on the distributor its gonna miss fire..check your owners manual to see the timings
change your sparkplugs
Strangest thing, I let the car sit for 3 weeks and went back to drive it, now its missing terribly. I changed wires, changed fuel filter, and its still missing terribly. I had a recent tune up done before this happened. Would appreciate and feedback anyone can give about this
Take it to a professional and have the valve lash adjusted. Also replace the spark plugs.
Check to see whats missing when it won't start. Needs fuel & gas to run.
Check all vacuum lines
this is most likely a bad injector. Try a tank of premium gas and Lucas injector cleaner. If it still misses, you probably need to change an injector.
The cabin air filter can not cause a rough idle. It only filters the air for the ac/heater.
i have to same problem with my sierra ive changed the filter and it still leaks, i was told that its the oil filter adapter you can get one at autozone for about $20
was fuel filter replaced
check that the O ring was replaced when oil filter was changed. id O ring is good and filter is tight, and housing still leaking, replace filter housing
Have you changed the air filter too?
Do a compression test to determine condition of engine internals