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03 issue

662 views 0 replies 1 participant last post by  RebMatt 
#1 ·
Well guy bare with me here, I just bought an 03 qblb and its got an extended crank compared to my 06 trucks and when in park in neutral it idles and runs fine, now when you shift the truck into drive and back to neutral the rpms go form idle to about 1400rpms. And when you the truck is in drive with your foot on the break it has dead pedal. When you shift from the drive to neutral it has a rpm jump. When the truck is in drive idling at say a stop light the truck in blowing black smoke and sitting at 800 rpms. I haven't got time to diagnose anything, but I don't know where to start. Let me know if you have any issue like this.
Thanks for your time.
 
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