Mechanics

F150 ROUGH IDLE, ENGINE LOPES

1997 Ford F-150

Engine Performance problem
1997 Ford F150 6 cyl Two Wheel Drive Automatic 482000 miles

Engine idle is very rough and it lopes and sometimes it cuts out. I've replaced the plugs and wires and it still idles like crap. I connected a timing light to #1 cylinder and found that the spark cuts out and is the same for all the other cylinders when I checked them the same way. When I drive on the highway there are no problems it seems to run fine, but around town its a little rough. Could it be the coil pack or ignition module. Please help !
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Zedman57
February 26, 2009.




The ignition module either works or it doesnt the coil pack could be the problem

Tiny
Rangerdanger17
Feb 28, 2009.
Could be leak in vacuum line or intak gasket
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Tiny
Johnnieandpam
Feb 28, 2009.

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