Hello all. I know the rules, and sorry. I couldn't a thread related to my particular problem. If there is one, I couldn't find it.

With that being said, I have a 98 GMC Jimmy SLS with a swapped motor (still a 4.3) and a 4l60e trans. I recently did a flex plate (not once but twice.) And after I finished, I drove it for a bout a week. Needless to say, I'm having issues now, go figure.

Uhhh... in the three manual gears, I have almost nothing, I can shift the whole way through them at 2k rpms and I don't get anything. May 5mph. In drive, she bogs before she even attempts to get moving. I have absolutely no reverse, and neutral, well... it's neutral.

I've done a great deal of research and I'm finding plenty of different things.

So here's the facts:
​​150k miles on motor.
Over 300k on tranny
brand new flex plate, starter, neutral safety switch, new starter wires, new distributor, brand spanking new tranny fluid (just flushed and refilled today.)

The poor thing has over 300k miles so I only expect to encounter problems. If anyone has any idea, it would be greatly appreciated. I own a business and this vehicle is my life line.

 

Any codes? What work was done right before this started?

George

 

Those are the codes it threw. And I even got my hands on a decent one. I don't know how to read the top one.

 

It looks like there may be 5 codes and P0452 is the first one. What are the other 4?

George

 

O2 sensor stuff. It's because 02sensor 3 isn't even plugged in. Never has been. I can run it again after work tomorrow, but they're o2 sensor codes.