I picked up a used t-100 a few months ago for less money than it would cost me to fix the a/c in one of my GMC suburbans ( $1,000) even though it had 180,000 miles on it, it was well cared for and ran perfectly. The a/c blew at an amazing 40 degrees ! Last night, on my way home from work...I was sitting at a light in drive gear with the a/c running...suddenly, the entire truck began to shake and felt like it was going to die. I turned off the a/c and tried to use the gas pedal to bring it back to life. I got home ok (did not use a/c again). But now, there feels like a skip in the engine while idling even with a/c off. I am wondering where to start checking ?? Plugs, coils...I am assuming that it is electrical in nature...but am not sure. Any help would be much appreciated. If it was my GMC, I would be confident that I would be able to isolate the problem. This engine reminds me of my outboard on my boat...with the individual coils etc. Thank you in advance...
What year is yer T100? On my 1993, there is a idle up component near the airbox. It looked as it had dropped off and the wires got eaten by the pulley. I had to resplice the wires to git it working again. You might want to check there.