1986 grand marquis running rough


Old 08-15-06, 06:15 AM
Michael's Avatar
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Join Date: Nov 2005
Posts: 56
1986 grand marquis running rough

1986 5.0L starts fine plenty of power new wires, plugs, cap, rotor, coil, ignition module, Runs fine under hard acceleration after all upshifts are complete when going from 50 to 55 (light acceleration) misses and runs rough. Some rolling and surging occasionally at idle. Driving my father nuts
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Old 08-16-06, 02:24 AM
Join Date: Nov 2002
Location: Canada
Posts: 105

seems like you have air getting in somewhere either thru a broken vacuum hose or gasket. Could be intake or carb if your car is not fuel injected. Happy hunting...

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