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2002 GMC Sonoma Questions

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when tank is between 3 quarters and full the gauge goes back and forth alot while sitting still at idle
Several oil leaks on the pickup. Been sitting for over a year due to my dad's health. Been told from a mechanic that head gaskets are leaking, timing cover, value covers and oil pan gaskets need replaced should buy a new engine. This seems a little extreme, the vehicle has 99,500 miles on it. What could it be, would a dye test be recommended. is the engine shot? Please help. Do head gaskets leak, I understand value covers but never heard about head gaskets.

Thank you
Heard a small bang or crack when putting truck in reverse and then reverse was gone and now 1st gear takes too long and uses too many rpm's before switching itself into 2nd gear (truck is automatic), but otherwise truck drives fine so far. Incident occurred yesterday, minimal use of vehicle since.
The battery light comes on for a few seconds then goes out then comes on then goes out. It just keeps doing it.
won't even try to turn over, if battery gets fully charged and key in on position for about 5 minutes then will start but only will run for a day or two
I changed fuel pump because it stopped working. installed new style ac delco pump assembly. fuel gauge worked just fine before that. new connector and wire splicing is correct. truck engine is running not a good gauge reading
On 2002 4 door Sonoma . And where is the fuse for transmission
We changed the intake gasket the rotor cap changed the plugs. There's no water in the oil and it does not smoke
After replacing fuel pump (seems to work). No start. Pre pump problem. almost starts, To test for spark there's no room to connect test switch to starter. Can I bypass solenoid in fuse box, for remote switch?
was wondering other then oil pump what else could be the problem.
Couldn't undo screw(s),there's a cable wire?what do I do?
Service engine light, voltometer, & oil pressure only things functioning.
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