Have a Dodge Ram 1500, 90,000 miles. When I got it, the air conditioner would blow out the defrost on acceleration or under load, and it would hesitate on corners.
Put in a new vacuum check valve, new plugs and wires. Still ran poorly. Traced, found that the line to the cruise control was broken. (Vacuum gauge shows 24" vacuum) Replaced that, and found that the new check valve was now broken. Replaced that, and on the test drive, the check engine light was gone, and it ran good. Right up to the first intersection, where it started hesitating again.
When you accelerate, it pops and chugs, but once you get going, it is ok until you stop at another intersection.
I now have a second bad check valve. What can cause this? Bad MAP sensor? I kind of hate to just throw parts at it at random, but getting ready to.
Monday, April 29th, 2013 AT 7:40 AM