Chevrolet Suburban 2500 Questions

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I have a 1990 gmc 2500 series and it overheats while in traffic or at a stoplight
tech at smog said my idle should be around 550?
truck looses power when trying to start it. All battery connections and grounds art good. What can cause the loss of power under the dash and then in a few minutes, return power?
Instrument cluster went out, electronic display (dic) not working at all, speedometer, tach, oil pressure, etc. Not working. engine lights work but no guages
When I'm going up hill it some times gets stuck in 2nd gear then I'll pull over turn it off for 30 sec to a minute and start it back up and the problem will go away till I go up hill again
Sounds like coming from cd player
Battery good. It still won't do anything doesn't crank turn over nothing. What else do I need to check
Hello all, my Suburban lost its power steering and brakes at the same time last week i've notice that i have fluids all over the place on the drivers side of the engine brakes are kinda spongy then hard.. I've been told that it is the pump or the hydro booster my engine isn't listed here i have the 5.7 vortec could some one please point me in the right direction
I'm very confused on how to get to the center panel fusebox. How do I access it?
New batt and starter,turn key and horn beeps.
Replaced batt and starter will not crank,turn key and horn blows.
Have a diesel when I start it it up when it's dead cooled it spills some coolant out of the reservoir any suggetions
Plugs, starter and battery are good
both are factory chevy rims
gear shift in any position. starter engages when go to second notch on switch
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