Depends on the cost of the repair and the overall mileage/condition of the car.

A good read. http://www.2carpros.com/first_things/car_cranks_but_wont_start.htm

Timing is not adjustable.
The computer would not just fire one plug.

A backfire thru the intake can be caused by a slipped/broke timing chain set, hung or burnt valve/s, leaky fuel injector, or an incorrect firing order.

Some things to check.
Have a compression test done.
Coil, their terminals, their connections, their mountings.Can you swap coils and see if the problem follows the coil.
Are the plugs wires run properly?
Are the plug wires good?
Crankshaft position sensor.
Camshaft position sensor.

It is never simple. :(

Good luck and let us know what you find. :)

Answered by peppermrj
19 questions asked

Hey try the GM section. Might get a few more ideas/opinions. :idea:

Answered by peppermrj
19 questions asked