1990 ford truck has a 5.8 in it only 67,000 miles on it. idels funny and kind misses when you drive and lacking power. funny thing is i changed plugs and the old ones looked perfect. changed the plug wires with no luck either. it can not be to seriose but it is driving me nuts .
Could be a long list of things including dirty injectors or a leaking EGR valve.
The coil could be weak or the distributor cap and rotor may be shorting to ground. Has the fuel filter been replaced ?
You'll have to go down the list and try to eliminate components to narrow down your options.
Does it happen all the time, only when you are accelerating, etc.
SOURCE: Engine shutter and lack of power
You probably have a vacuum leak somewhere. Check for broken or cracked hoses and/or plastic pieces they connect to. Pay special attention to suction pump, part# 058 133 753 B. Google it.
SOURCE: O3 ford escape V6 began hesitating and missing at
change the plug wires they may be bad. or you may have a bad coil
SOURCE: I have a 1998 ford
Have a compression test done ,and look for a vacuum leak near the cylinder,like a vacuum hose or intake gasket.If the compression test shows a fluctuation between the 3 and 4 cylinder,then the head gasket would need to be replaced.
SOURCE: I have a 1999 chevy
Assuming none of the wires are crossed, AND you replaced the cap rotor wires with quality replacements (meaning AC Delco) then you may have a bad coil. Remove coil from dist cap if HEI and look for any signs of arcing such as blackened areas.
SOURCE: Ford F150 engine backfiring, running/idling rough
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?
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