Mechanics

ROUGH IDLE

1991 Cadillac Brougham

Engine Performance problem
1991 Cadillac Brougham V8 Two Wheel Drive Automatic 192000 miles

My car idles rough anytime I drive my car over 55 and then I come to a stop it will idle rough. To fix this problem, I floor it between 40 and 55 and it fixes the problem. I think there is leftover gas in the cylinder and not all is burned off and leading to power leftover in a cylinde ror two. I changed the spark plugs and wires and that handled the idle better. I have been told on eof the cylinders may be failing and my car does burn oil at its mileage. I am wondering if my valve seals are abd or if my cylinders are losing compression. Please Help.

I have replaced the following
TPS Sensor
EGR Valve
IAC Motor
All Vacuum Lines
TCC Solenoid
CAT
Speed Sensor at transmission and drive shaft
Fuel Pump and Filter
Avatar
Jgroff05
April 5, 2010.




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