My 93 Jeep Grand Cherokee Limited has a rough idle..real rough....
So, I cleaned the TB with a can of 3m spray, replaced the ignition coil, tried a new battery, checked all the vacuum lines I can find and finally a compression check.
Compression on 2 front cyl's, passenger side are 65psi, and the front cyl had a sooty plug. All others are right around 125 or so with nice clean plugs. Engine runs right about 205-210 even with a/c full blast!
No oily residue in coolant, no water in oil. Nice and clean on both parts.
Is it possible the head gasket could just be blown between these 2 and not leaking oil/water?
Stuck lifters maybe?
Valve carbon buildup?
When I say rough idle, I mean, you could work kinks out of muscles at the stop light! Give her some gas, and she smooths right out and away we go.
I figure, I'll go to Jeep tomorrow and pick up a can of whatever cleans the guts out of these things and see what happens, but wanted to approach the experts here and see if I missed something before I start yanking heads off!