check haynes manual "firing sequence" or "firing order"
Need to know what size engine.
you are not getting spark. this could be from a bad alternator, bad spark plugs, bad spark plug wires, or bad engine coils. The spark plugs and wires are the cheapest so try putting in new ones of those first.
Spark plug wires. spark plugs or fuel filter. Check and rpplace them in that order. Usually only spark plug wires need replacing.
Count the number of spark plug wires. There is one for each cylinder.
The spark plug wires connect in the 7,3,5,1, 8, 6, 4, 2 order on the 350 motor for the Chevrolet Silverado made in 1990. This changes in the models built after 1990.
change distributor cap and rotor
try the moduel
1-3-4-2 Distributor rotates clockwise.
there is no gapping needed
left side of engine directly under the distibutor (where the spark plug wires plug into)
.039 - .043 in .99 - 1.09 mm
Might be the spark plugs or wires... when the vehicle heats up, the wires expland and they break apart making very little to no spark until the wires cool down and contract, restoring the connection.