What would be causing my 1997 ford explorer to start running rough when I press on the throttle?
The engine is a 4.0L 6 cylinder, runs fine on idle, no check engine lights, but as soon as I touch the throttle it starts to shake and run rough. Any ideas will be greatly appreciated.
It's around the time the fuel pump starts putting out less pressure so get a fuel pressure test done. Usually it will trip a lean condition code if this is the problem and need scanner to read it. Then the possibility is bad plugs or wires. Does the CHECK ENGINE light come on when you first turn the ignition key? This is the self test and it should light and go off when engine starts if there are no codes stored in the ECU.
Could possibly be a dirty fuel filter. If fuel can't flow thru dirty filter properly it may affect your performance of your motor. Maybe a cheap fix. Hope this helps.
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