Knock sensor

Agree, but what does this have to do with my timing? What would make the timing jump like that. The book says that the knock sensor would do that to the timing, do you agree? It is not giving me a code for that either!

Thank you for all of your help! 2carpro's is top's with me! I cannot do anything with the catalytic converter until I get back working. I tried getting under the truck and opening the exhaust but the nuts are really on tight, and the top one will require removing the cross member, I think. I guess I will just continue using it as is and the next thing to replace is the catalytic converter.

So Roy, do you think it could be the catalytic converter causing the misfire?

Thanks, but what could it be?

I checked the MAF myself and it is at 4.7 volts and the shop checked the fuel and said the fuel, fire and compression was good. So I guess it is going to just be a gremlin no one can figure out. Thank you

Thanks Roy I will, but how else do I check it? I have used a meter for volts and pulled it out while running and seen it change in rpms. Anything else?

Alright, sounds good, I will do that today and will let you know. What about the reading from the live data that I sent you yesterday, it showed the MAF at 0.6 lb/min does that sound right?

I know it bounced around when idling. So what should I see it do on live data if I raise the rpm?

Okay Roy, I will take a look at it and will let you know. Thank you

Roy, what should my fuel pressure be on this 1998 4.4 GMC Sonoma 4X4?