98 Tahoe no start...

Redfamilysavages

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The truck has under gone some maintenance, we change spark plugs, oil, oil filter, we ran into the problem where it randomly wouldn't crank over. We suspected fuel pump, changed that out, started it up noticed the pulley system for ac had some barrings going bad.. we deleted the AC put a new pulley system on for belt... Truck started. Had a rough and very low idle.. 500 rpms.. we drove it seem to have no issue. Besides the low idle when we were stopped (red light, stop sign) such a low idle it would kill itself... Driving 65 on highway the rpms shot up died shot up and killed the truck..
The fuel pump still runs we have replaced the fuse for the fuel pump, honestly just running out of things it could be, need some help before I junk it. I know it's something so simple. It's never ran like this before.
 

PNW NBS Z71

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When you say "randomly won't crank over", that indicates a problem like a dead battery. If you mean the engine is spinning but will not fire off, that is a whole different problem, so you need to share the correct info. These engines are known for having the injector spiders giving problems: https://www.rockauto.com/en/moreinfo.php?pk=8323856&cc=1303872&jsn=931.

May also have a problem with the idle air control vale: https://www.rockauto.com/en/moreinfo.php?pk=88851&cc=1303872&jsn=937. This is what senses loads on engine and helps adjust the air fuel mixture supplied to the cylinders.

I would also want to be sure that you did not damage a spark plug during install.
 
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