I recently purchased a 99 Suburban. It has the 454, not sure on what transmission or the gear ratio in it at the moment.
The cats were cutoff and it was loud as hell on the drive home. So I put an exhaust on it right away.
The guy I bought it from said he rebuilt the top end and after that, the engine had a miss to it.
I plan on changing the oil, and air filter right away. It does have a check engine light on but I don't have a code reader so I'll wait to take it to the AutoZone store nearby.
The popping and sputtering is pretty obvious when driving it around the neighborhood.
If anyone else has had to deal with a misfire, what was the cause of it and how did you fix the issue?
Thank you in advance for any and all replies.

 

Welcome from Florida. Get the codes read as this will lead you in the right direction to find the problem. If it started to miss after he did the work, then he may have done something to cause it.

 

ok, I have an update. I hauled my suburban to my buddies place. He is a certified mechanic and into chevy motors. He pulled the codes ; one code was for a MAF sensor, one code for distributor being out of time, and there was one other, but i dont recall what it was. He changed the cap and rotor, timed it and he found a really bad vacuum leak. Once the vacuun leak was sealed up, the 454 started running perfect. He cleared the codes and nothing has come back yet. Time to start cruising it around and see what happens next. Thank you for your reply.