Questions & Answers for: grand marquis backfires start

Grand Marquis starts up fine,but if i try to drive off,it barely goes 10mph.Also starts backfiring..simply can't/wont rev up past idle speed (which runs really smooth) ..once it warms up,then it seems

...While driving my 1992 mercury grand marquis, I can hear backfiring under my hood. What can that be? I put my foot into it and it'll stop, but after I let off of it, it will start back. ...

Jerking on normal acceleration. Upon regular acceleration, the car has started jerking and backfiring. However, on heavy acceleration, it runs fine. Has new spark plugs and wires. You might try a TPS ...

...start over sometimes it fixes problem. It feels like all of a sudden someone releases the car and bam just like that it has mass horse power again. Also backfires under hood at slow and fast speeds. ...

...grand marquis 8 cylinder it ran out of gas and now it will not start. after it put gassed the car up gas is getting to the motor but still will not crank and it did backfire once fuel pump may be ...

Grand Marquis.... Runs rough from a cold start. Usually backfires a couple of times---feel it underneath me... then smooths out with acceleration. Seems like it's skipping at red lights and when idle.

...grand marquis 4.6 with a 2009 crown Vic 5.4 engine and was running fine until I broke my ignition and tried to replace it myself I bought a new ignition switch didn't work so I bought a steering ...