1991 cutlass running poorly
 

Hi everyone i have a 1991 cutlass supreme cranks fine runs rough it will act like it is OK and stall when cranked the exhaust is so strong it only a short time you can stand it. Not always but mostly it is hard to accelerate, when you can get it to run it will miss or hesitate miss might not be the correct word. The car has had NEW injectors,filters,wires, plugs, egr, The car has 145,000 miles and has been a very good car. Oh and there is a delay in the accelerator that has been through countless shops the map has been cleaned with map sensor cleaner,and the crankshaft position sensor has been replaced. please help anyone, anything would be very much appreciated. I am a new member this car I have owned from 1991,I also have a 1994 Cutlass 65,000, it is really great to find a forum like this.