Any idea where I can get a 1988 corvette 1988 replacement key

Only if you new your key code, their are 15 of them. Check your manual, it may be written in side. Other wise their is no cheap way.

Hi John.
go to this link and see if its what you are after.
diagram for power window circuit 1988 corvette Google Search

you mite check your turn signal lever some push some if you pull it toward you. hope this helps

The Fuel Pump Relayis located: Under hood, passenger side, upper firewall, mounted on passenger side of blower motor

replaced the thermostat on the engine it is stuck open

Sounds like a bad EGR valve or a plugged catalytic converter. I'm not there or I may have a different opinion but that's where I'd look first.
Good luck

Is it the lights or the LEDs? If it's the lights, check the fuse first. If the fuse is good, check the dimmer switch. Do the other lights inside dim? If no replace dimmer. If yes, then you can remove the dash cluster from the dash and replace the lights. They are installed in the back of the cluster and are very cheap.

try different speaker if works .its the speaker. if another speaker does the same .your radio is the problem.

You can try a locksmitch take the vin.# from the car with you and they can make one.

Hi

Sounds like a new steering lock I am afraid !

Good Luck !

John.