I HAVE BEEN HAVEING ISSUES WITH MY 97 CADDILAC SEDAN DEVILLE 57,000 MILES

ENGINE BUCKS BETWEEN 50 AND 62 MILES PER HOUR NO MATTER THE GRADE OF GAS TRIED FUEL INJECTION CLEANER WITH GAS DRYER


EVERY 3 -400 MILES THE ENGINE WILL SHUT DOWN WHEN GETTING OFF THE HIGHWAY TURNING TO THE RIGHT WITH NO WARNING THE ENGINE SHUTS OFF

I GET THE FAINT SMELL OF UNBURNT UEL FOR A FEW SECONDS WHEN I SHUT DOWN THE CAR

ENGINE HAS A RATTLING NOISE COMING FROM THE FRONT END WHEN A/C IS ON GOES AWAY WHEN A/C NOT RUNNING

I AM GETTING A LOUD THUMP UNDER MY FEET AT TIMES NOT SURE IF IT IS THE TRACTION CONTROL OR WHAT ELSE IT MIGHT BE

 

Have you tried replaceing the plugs and wires? And checking the coils for corrosion, I wouiild also higly recommend you using Factory parts for this....