90 Acclaim alot of carbon out of tailpipe and on plugs

I have a 90 acclaim 4cyl 2.5 engine stalls, shakes and sputters, changed plugs , wires, cap ,rotor, Throttle position sensor, fuel pressure relay, and fuel filter and it has not helped, new plugs now have alot of carbon on them (only after an hour) and alot of black carbon is coming out of the tailpipe onto the driveway. Please help.

you can decarbonize the combustion chamber write me i'll tell how.

it sounds like it needs to have the heads rebuilt cause the oil is getting by the valves and is burning in the combustion chamber and is causing all of the carbon fouling which must of been burning for a long time to be coming out of the tail pipe. sorry to say they dont sell any magic fluid to fix this problem but find a competent machine shop and get a 3 angle valve job. good luck