Tranny gone BAD or Cat converter plugged?
 

I have a 98 blazer 4x4 with 148k miles. ran fine until one day i noticed engine revving harder to move from a stop. sometimes acts up and takes a lot of time to get to 55 mph. gotta let off gas some at times to get up to speed. can anyone help a Marine diagnose this problem. dont want to get raped at repair shop if it is something like a plugged cat converter. 6 months ago got engine tune up at dealer and replaced plugs with ac delco plats and plug wires and got throttle body cleaned so i dont think its in the engine. now service engine light came on three days after topping off tranny fluid (wasnt low extremely, just needed a little to read full. thanx for any help.

RE: Tranny gone BAD or Cat converter plugged?
 

Did you have the codes read when the check engine light was on? If so, what were the codes (Pxxxx)?

RE: Tranny gone BAD or Cat converter plugged?
 

Yes, check the codes, but sounds like it could be the cat. I just recently had the same problems and it resulted in the cat breaking loose and partialy plugging the muffler. I heard it rattling before it acted up. If you tap it and it sounds loose it probably needs to be repaired.

RE: Tranny gone BAD or Cat converter plugged?
 

Welcome Jarhead.
Keep answering the questions and we will get you going in the right direction.
Semper Fi.