1995 4.3 tbi, 247,000 miles. It is getting gas and spark, I had the ignition module tested at autozone and it passed. I have also changed the coil. Cranks but will not even try to start, all I can think of is timing belt or chain, not sure what it has. I saw the gas spray in the throttle body and saw the spark from the wire. Is there a way to check the timing belt without pulling a valve cover to see if the rocker arms are moving?