97 gt hope it’s not what I think

rdtavape

New Member
Jun 1, 2018
16
0
1
44
Tucson, AZ
I’ve switched around plugs, plug wires, coil packs and the same cylinders continued to misfire. #3 and number #7. So today I removed the plug from each cylinder and dripped in a little oil and when I started her up it’s the best she’s run in a minute. So I went for a drive about a mile down the street and turned the car off and when I started it again maybe an hour later it’s running rough as hell again. Misfiring I’m sure. That being said, am I looking at having to replace my piston rings? Cuz if that’s the case it’s time for a new car. I do all my own mechanic work but that’s just too much.
 
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Mar 25, 2020
72
5
8
20
Springfield,MO
I’ve switched around plugs, plug wires, coil packs and the same cylinders continued to misfire. #3 and number #7. So today I removed the plug from each cylinder and dripped in a little oil and when I started her up it’s the best she’s run in a minute. So I went for a drive about a mile down the street and turned the car off and when I started it again maybe an hour later it’s running rough as hell again. Misfiring I’m sure. That being said, am I looking at having to replace my piston rings? Cuz if that’s the case it’s time for a new car. I do all my own mechanic work but that’s just too much.
Personally I think I’d start with a compression test, that’ll tell you what you need to know more than likely.
 

GT4Lyfe

Member
Feb 21, 2021
38
2
8
36
PA
The spark plug insert grommets go over time which allows oil to leak in, as well as valve cover gaskets. I'd try replacing those first, then shoot for compression test.