My car shudders and sputters on the hwy. Sometimes when i hit a bumpy section of the road or when I let off the gas and slowly get on it. It also stalls when I put it in reverse. Please help!!!!

My KS was just changed yesterday. The CEL just came on agian but I haven't checked what it is yet.

what year max? if its a '99 could be your ignition coils as this is common on '99. How about the SES light? Is it on steady or flashing?

I'd prob. have autozone pull the code and see what the real cause for the SES is

It's a 99. With traction control.

Probaly isnt the problem, but I had similar issues recently, and a wire on the MAFS was partially cut, and them completely disconected...just worth a check.