I have a 2000 Chevy tahoe and 1997 Chevy 1 ton they both quit on the same day. No check engine light came on I have replaced the distributor cap the rotor and the ignition module on both vehicles I've also tested the fuel relay with a paper clip the fuel pumps run, both vehicles backfire like they are out of time, you can smell fule backfire through the intake. What else can I replace?

try to change the rotor and the distributor cap and the high tension wire.

Check your coil pack. Sounds like one or two need replacing.

EGR Valve and Back pressure valve. Those will cause idling issues that will make your vehicle do what it is doing now.

If compression test is good is either no spark, bad coil or wire, or no fuel, bad fuel injector. Need to clarify which is not functioning properly.

Start with fuel system. Listen for fuel pump humm at fuel tank No humm check wiring to pump for power. Then check for spark at plugs and wires. Remove wire from coil and hold near engine and see arch when you crank. No arch. Replace ignition Modular inside distributor cap or cap or rotor

first thing to do is after trying to start engine, remove a plug, see if its wet or dry. if dry, no fuel getting there, if wet, ignition problem, then we willl take it from there

P0300 is random multiple misfire. If its been more then 3years since the last tune-up, do one. Usually it is caused by debris inside the distributor cap but could also be plugs wires, fuel and air filter.

The light is flashing because the engine is miss firing. The first thing I would try is replacing the distributor cap and rotor.

I have the same problem. I punched the screens all the way though that are down in the distributor. This did not correct the problem but it did slow it down. Now I only have to change the cap ever few months. I don't leave home without a spare cap.

check engine light comes on after driving any given amount of time. Replaced egnition modual didn't work, replaced pcv valve, didn't work, replaced stater module, didn't work, replaced the fuel filter, didn't work. Took it in for diagnostics and was told that it is either the egnition module, computer, or the wires that are attached to the computer that go out to different parts in the engine.