Backfiring,trans dosent down shift, speedometer doesn't work

Asked by Jul 18, 2018 at 05:26 AM about the 1995 GMC Sierra C/K 1500

Question type: Maintenance & Repair

My speedometer quit working truck ran fine.
Now truck runs good while engine is cold,
After running about 5-10 min. It starts
spitting,sputtering, coughing, and  I have. To
just  feather the gas pedal.
Today while driving it went dead and the
speedometer started working I put truck in
neutral and cranked it, it in good for about
15 seconds and started cutting out again,
speedometer quit s while motor running. But
will work with switch own motor off. And
after u let truck cool down it runs good
again. (Help!!!)

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