As long when I crank up on my 06 Silverado truck. It's won't run and it's werid shake engine. So few minutes later I crank up again. It's fine. I drove like as normal. One hour drive to arrive home and pull over it. I turn off and cra k up won't run and feel like backfire once tine. I tried cra k up again it's run fine. What's wrong with this? I replace crank sensor last year its been fine since. Now again problem.

 

Check for cracked spark plugs and or bad wires..
Check the all the grounds also

 

If it was about spark plug, spark wire. They are good. And no misfired at all. Still hVe all good power. I did replace the crank sensor. Still same. My dad think its computer PCM went bad? I'm going contact Allen Nelson that who tuned on mine. Been had PCM by him for 4 yrs.

 

o2 sensors went bad? or maf could be going out to, mine went bad and i had no check engine light or anything, it was just reading wrong.

 

So.......... what you're saying is, you crank up the truck, and it runs fine. Then, it back fires. You try to crank it another time, it will not crank. Then, later on, you crank up the truck, and it runs fine, then it back fires......

You've got to do a little better than that, describing the problem that is. Also, I know the autozone's and advanced auto parts stores around my area will hook your vehicle up to a diagnostic machine for free. It may be the same way in your neck of the woods. Not that I would recommend buying anything there, but it's a handy free service for those that do not have another way to trouble shoot problems.

 

Listen my truck don't show the engine light on at all. How could be o2 sensor? I know Nelson did tuned. To cover the two o2 sensors since I run catless. It been fine for over 2 yrs.
Let me explain clear. At first crank up fine then turn off for like 5 sec crank up won't run. Missing spinning only once time feel small pop I turn off then try again. Its un fine. Drove like As new and still on power acceleration. Maybe PCM bad or cam sensor? Since I did replace crank sensor yesterday

 

Do you think it really cam sensor need to be replace? What would cam sensor do since i drive and park at home then turn off then crank up its turning over and backfire. I turn off then again crank up. It does run. I been wonder why it cause. I check all grounds and all are tight.

 

You replaced the sensor by the starter right??
When my cam sensor was going out the truck wouldnt start everytime..

 

Really. I did replace crank sensor still doing same. Cam sensor I havent replace. Wonder it will do?

 

I found it was camshaft position sensor went bad. Scanner show it is. So I tried to take cam sensor out. But it seem painass no room cuz its by firewall. I wonder who had done this before.. If you dont mind tell me how it work.