Alright here's a little update: Found a ground wire on the driver's side from the engine to firewall that wasn't connected. Connected that to the intake manifold (not sure if that is where it is supposed to be or not) and it fixed the problem. Few weeks later it came back. Looked under the hood and one of the bolts holding the bracket on (the one this ground is attached to) was missing. Figured the ground isn't getting good connection now so I attached a few alligator clip wires directly from the head to the battery (all I had on me) with no difference. Checked the continuity between the ground and the head and it was pretty good I think (couple of ohms - the multimeter beeped for what that's worth). Also tried unplugging the alternator which didn't help. Compression all within normal limits. Battery voltage good and steady.
Where would you go next? Any ideas? Think I'm going to try connecting a jumper cable from the battery to the block just to be entirely sure it isn't a ground issue. The car runs normal on the highway/high RPM. It also seems way worse when the car is cold or if I let it idle a while.
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