Posted by casebro on Wednesday, May 01, 2002 at 10:43AM :
In Reply to: still having a power problem with m37- please help posted by mannyc on Tuesday, April 30, 2002 at 10:25PM :
If the jet is plugged it will have a lean surge- like when you run out of gas ? Try just a little bit of choke to richen it.
The coil bad will usually cause a problem under high load since that is when it runs richest and a rich mixture requires more volts to get lit off. Coil tests don't help, can you try a donor coil from another truck?
To test for a plugged muffler, unhook muffler at front, test drive (the neighbors will love this!).Try to relate the power gain, not to the "sound of raw power".
Let us know what you learn, chris