I don't think they had carburetors on the 89's. They were throttle body fuel injection. As far as the backfire and loss of power, check the firing order (in case it got messed up), check the distributor cap and rotor for moisture and carbon arc. Check the spark plugs and spark plug wires for damage.
Look for a loose plug, or plug wire.
You have a loose/worn steering component. Outer tie rods are the most common.
Worn/loose u-joints are very common.
Tire out of balance, bent wheel, loose or worn suspension or steering parts.
Loose or worn A/C drive belt. Tighten or replace. If serpentine belt, replace.
If loose they will need replaced.
normally loose brake pads or discs
The causes of loose abdominal muscles include extreme weight loss and pregnancy.
check the exhaust system for blockage Can be that the plug wires were installed incorrectly. Can also be the timing chain is worn and has jumped a tooth. The distributor also may be loose and has turned so far the engine is out of time.
Loose intake boot or the boot may not be on straight. Happens everytime.
the passing of electricity through conductive and semi-conductive material
No, it will need replaced.