Help with a 1993 Chevy Silverado 3500 Diesel

MindyC
Mon, 24 Jun 2013 17:59:15 +0000
Maintenance/Repairs

Mechanics say they don’t know what wrong…

I had some transmission work done on my truck – mostly an leak and replacing the harness – and ever since then after it rains or if we have a heavy dew my truck does the following:

Driving from O to 49 miles an hour truck is fine, as soon as I hit 50 the truck starts surging and you can see the tachometer jumping from 2000 RPM to 2500 RPMs. I drive around 17 miles to work where my truck will sit for seven hours. On the way home the truck is fine. I find this to be more of a problem when the truck has sat for a day or two over the weekend without driving it. Sometimes the “check engine” light will come on, sometimes not.

I have taken it to two different places and neither one says they can find anything wrong with the truck. I have driven this truck for over 11 years and know it very well. There is something wrong, but what?

Can anyone out there in Car Talk land help me.

Thank you so very much.

Mindy

11 posts - 6 participants