1991 Cadillac Brougham



April, 5, 2010 AT 3:46 PM

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
Speed Sensor at transmission and drive shaft
Fuel Pump and Filter


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