Hey guy's, mark here. Got a low RPM miss when I go up a grade on turnpike at highway speed. No check engine light but I need to get fixed. Engine is 3.1, 98 model. Could someone please help me as where I need to start. Does it sound like its tune-up time(plugs, wires, etc)

 

If it was an ignition miss, it would be throwing a P0301 or similar code. It sounds like dirty fuel injectors to me (possibly needing a valve job, also). I would start with a can of Seafoam fuel injector cleaner in a tank of gas, and "drive it like you stole it". Repeat as needed. Then start using top tier gas instead of the cheapest available, ESPECIALLY independent stations.

 

how's your filters???

 

yes seafoam the 7 dollar can that will feel like a brand new car for a whole tank. i use to have a lumina with the same engine. if you cant remember the last time you had a tune up then do. also i belive techron does the same thing and its recomended by gm.