1993 Mercury Cougar engine

1993 MERCURY COUGAR
120,000 MILES • 3.8L • V6 • RWD • AUTOMATIC
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CHRISSY99
  • MEMBER
  • 1 POST
When accelerating and maintain a speed,everything is fine. When I totally let off the gas,its ok too.The problem is when I let off the gas just a little to slow down some,you feel a slight bucking. At a slower speed you feel a harder bucking at about 35mph or less, and slight is more around 65mph or less. The C02 sensor has been replaced.That didn't change the problem.
Nov 28, 2014 at 9:03 AM
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HMAC300
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 48,601 POSTS
scan for codes and check fuel pressure first with a gauge should be 30-45 psi key on engine off. Auto parts rent it
Nov 28, 2014 at 9:17 AM