1986 grand marquis running rough

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  #1  
Old 08-15-06, 06:15 AM
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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
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vacuum

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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