misfire on slow accel on 5.0 liter eng on 91 merc grand marquis

Asked by cjblock5649 Nov 17, 2016 at 11:41 AM about the 1991 Mercury Grand Marquis LS Sedan RWD

Question type: Maintenance & Repair

misfire bad shudder on 5.o liter on my merc grand marq on slow accel but no bother if I shove the pedal down no shudder.. put on plugs wires coil ignition module, what else canit be tranny expert said nothing wrong with tranny. misfire somewhere, but where tried injector cleaner not drove it yet far though.

1 Answer
5,405

Trippmeister answered 7 years ago

Either clean the MAF sensor by the air filter, (with maf cleaner), or get a rebuilt one. This fooled me a long time until I learned about it the hard way. If that doesn't do it, do a scan and see if there are any fault codes, and google them.

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