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It could be the dash light fuse, maybe need help to find it. Has nothing to do to the starter.
3.8 would be in the top of the plenumn at the front, pulley side, of the engine. The cap has to twist to release the cap and access the PCV valve.
Have them check the head pressure, possible flow restriction of Freon. Just a thought.
Sounds like a possible bearing, have a mechanic listen to it.
Take it to the dealer, and they can get a code out of it and call GM for an unlock code.
Does it have a cabin air filter?
Cross bar bushings on the front axle are bad. It is suspension related.
Have the computer scanned for the codes, that will lead you to the reason for the light.
Have wiring tested from coil to computer, and B+ for 1 & 5, if the coil is not firing.
Do the engine codes call for a crank or cam sensor.