Starts instantly. Excessive fuel in exaust, gets worse as engine warms. then will stall. PO141,155,and 300. Changed O2's. Spark tester ok on both wet cyls, switched ignition packs on both - no change. Compression same on all 6 cyls. Drained fuel and changed fuel filter.
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no engines codes, is not true i bet ,
some codes take 1 to 3 trips, or dont store
and if you get CEL glowing, driving too much can clear the codes.
so.... that means you must scan it failing. see?
sputtering is misfiring (bad spark or way to rich fuel)
why do you jump all over fuel first.
try spark FIRST no gas engine burn fuel right with bad spark'
not one, and is first not last.
ever heard of tuneup, done one in last decade.
you know, spark parts? plugs and wire top list.
in the rules of basics its:
engine good, (compression test pass, and vacuum looks ok)
why do that backwards/?
SCAN IT FOR IDLE SPEED CONTROL PROBLEMS.BUT OTHER POSSIBLE CAUSES TO YOUR STALLING IS BAD PLUGS AND WIRES CLOGGED FUEL INJECTORS AND CLOGGED FUEL FILTER.IF ALL IS GOOD HAVE FUEL PUMP FUEL PRESSURE CHECKED IT SHOULD BE 41- 47 PSI.
When it dies..check for spark. You could have a component in the ignition system failing when the car gets warm.
If you don't have spark then you might need a new ignition module. The distributor cap and rotor should be checked for traces of carbon. This would be evidence of a leaking cap.
If you get check engine codes then you do have some sensors going out of range or failing all together. P0446 is an evap code right?
Make sure your fuel cap isnt plugged up and all your evap lines are ok.
it starts from cold because the auto choke is on ,allowing a richer mixture ,try removing the sender unit in the tank and seeing if the connection from the pump to the outlet connection is ok or leaking causing a loss of fuel pressure