Got a 90 Silverado that is running poorly...It runs a bit like it has a very heavy trailer behind it. Doesn't seem to be missing but chugs along done all I can think of but still no change. 02 sensors fuel pump map sensor. there is one thing that is odd if the turning signal is flashing runs fine if I hold the window up botton it also runs fine does any one have any ideas where to go from here?

 

Great to hear from you bigblake61! Welcome

 

Welcome to the forum.

You might re post your question in the Silverado section for more views.