What to do now?
Thread Starter
Junior Member
Joined: Mar 2013
Posts: 5
Likes: 0
pulled codes from the new "used" ECM. Brings up a 126 & 552. Dont understand why with this ECM, the truck barely starts and runs. Extremely sluggish, little to no throttle response and soon as ya let off the throttle, it shuts down... BUT...with the original ECM plugged in, it runs fine..other than that pesky, intermittent misfire under load??? Checked & replaced plugs, wires and checked for vacuum leaks...actually did that a while back. Haven't checked compression yet...will do that as soon as I get time..
It's a Canadian thing eh!
Joined: Nov 2010
Posts: 6,539
Likes: 196
From: Ontario, living across a hay field
