2000 Mercury Marquis misfire

128,000 MILES • V8 • 2WD • AUTOMATIC
Avatar
WAYNE EASLEY
  • MEMBER
  • 1 POST
periodically the engine misfires when letting up the accelerator part way it never misses when accelerating hard. Have replaced plugs, boots, EGR valve and sensor, Crank position sensor and had fuel pressure checked. Replaced fuel filter and tranny fluid. Its driving me nuts. Please help!!! Thanks!!
Sep 21, 2010 at 1:39 PM
Advertisement
Avatar
RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Clean and test the idle air control valve and the MAF sensor
Sep 21, 2010 at 3:24 PM
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Frequently Asked Problems for This Vehicle