Fuel Issue-Running Rough And Stalling While Driving

[cruiser54]

Sorry for your loss.

[mountainman]

My condolences.

 

Uhm, if you brought down the HC ppm that far thats pretty damn clean, next step is....your cat converter is prob toast.

Is it new? has it been tested? If not, best bet would be to put on a new cat and youll pass with flying colors.

Also if your worried, have it flanged at both front and back and have them make you a "test pipe" with same flanges.

Then after smog take the cat out and put the test pipe in.

Then work on your tune and system till your confident you have it 100% and its getting great mileage and has no issues.

Then either save the cat for smog time again, or put it back in and leave it in once its dialed.

 

With a good working cat youll have VERY low HC showing on the machine. The cat scrubs off anything left over that the engine couldnt burn. Thats its job. Do you have the CO readings handy?