Have a 1981 Fleetwood Brougham Coupe with the V8-6-4, 235k miles and it is still nice cosmetically. Just had a ton of work done to fix some problems and to attempt to make the car as smooth running as my previous 1977 and 1978 cars which had 425's. Mechanic put in a new computer, exhaust, tune up, belts, hoses, etc. Compression was checked and it is all good! The car runs much better now yet still does not have a velvet smooth idle and acceleration of the 425. We have not yet replaced fuel injectors and the plugs we put in are platinum and the mechanic feels they may make the car run hot. We have the shop manual. Want this car to run like a Cadillac should! Are we missing something? Ideas???
Thanks in advance!