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Faulty multifunction switch is possible.
Is the door light on, may be bad door switch.
Likley damaged wiring to front wheel speed sensors, very common problem on gm's.
Likley intake manifold gaskets are leaking, with 286k rebuild would be nice.
You may want to check for recalls, many many fords had their brake pressure switch recalled for leaking and causing a fire. The switch is located on the master cylinder. Dont recommend ever using used brake componets, it not worth comprimizing saftey.
Likely a leaking valve cover gasket.
beleive the door switch is attached to the latch inside the door.
North star engines do not have timing belts.
Replace the ignition wires.
If you are lucky it may only bend the valves, but it very well could damage the engine beyond reasonable repair.