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Originally Posted by
lothar863
I had this happen when one of my grounds had a weak connection. Car ran fine and no other issues. Cleaned up the ground point and bouncing needle went away.
start with the easy stuff. open the hood and look for the things that look like my writeup on coolant temperature senders for photos. pull of the one pronged, clean it up nice, reattach.
doesn't work?
lie on your back with your feet by the headrest of the seat, recline it all the way back first - then reach up and push the connectors in a little - mebbe it was dislodged. Then go back under your hood and look at the back of the intake manifold. There's like 2 bolts 10mm back there, make sure they are snug.