I have a '98 GMC K1500 w/ 5.7. Once in awhile it won't start. This is what it does as I try starting: fuel pump hums as it charges, starter cranks strong, fires like a regular star - but dies in a split second as if it only had time to fire a few cylinders. I try starting again and the same thing happens. As I keep trying about 1 out of 4 times it won't fire, then it fires again. It will keep doing this for 10 to 30+ attempted starts and then eventually it start and runs just fine. Sometimes I give it a Jump which doesn't seem to make a difference till the battery
starts weakening cranking slower. It doesn't matter if I remove air filter or relieve vacuum pressure. It has this problem about 1 or 2 times a month, more often in summer heat and rarely in winter. I have a long list of repairs and replaced parts over the last 2 years: fuel pump, fuel relay, fuel pressure regulator, fuel filter
, battery, starter, alternator
, coil, spark plugs (top brand), air filter, all O2 sens ors, distributor cap and rotor and probably forgetting something. Any ideas what could cause this? ? ?Engine
light on with codes: PO102, PO171, PO174, PO303, might be more. Have cleared codes and they come back.
Another thing that could be related, sometimes truck gets in this gutless mode when I accelerate it stumbles and shakes and runs so bad it rattles the whole rig ( similar to as if there are several spark plug wires disconnected). And other times it will run good, accelerate very good.