1990 Toyota Pickup * Starts good, idles until high idle kicks out * Running rough, idle rough, accelerates with power. * Replaced fuel filter, sparkplugs, and wires. New coil last year. No luck thus far.

At this motor's age the vacuum lines need replacing, new air filter, and see if it wants high test fuel.

tune up,fuel filter,cap,air filter.

new carbie???

check map senser if thats good check your fuel filter

I Have a 1999 ford f150 4.6 that back fires and is just running really ruff when idling alot of nack fire a sord of like a pulse going on what is my problem?

I would suggest also replacing all O2 sensors, PCV valve, air filter, fuel filter.. Just might clear it up.. Not expensive and if issue continues - you will have ruled all that out as a cause..

Have a nice day !

Probably the ignition timing is not advancing the spark on acceleration or high rpm's.

That is the job of the ECM (Electronic Control Module). Check it / Replace it.

Hope this helps!

change air filter.and fuel filter. replace plugs and wires.check tires air pressure.

I just had the same problem. Replaced the fuel filter,still crappy idle and no acceleration. I replaced the fump pump along with the wiring harness and the fuel pump screen and my cars purrs like a kitten,has back to normal acceleration and idles better than before. Hope this is some sort of help to you. I did it myself. Total cost, a little over $120. Good luck. By the way, your fuel pump should be pushing out about 65 lbs of pressure. is it ???

Sounds like both need the chocks ajusted or there sticking.