What causes my Chevrolet Silverado to erraticaly low?

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the light of linux

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It's a 1988 Chevrolet C1500, 350 V8, Turbo 400 tranny. Basically, it runs fine for a while, then when idling in park or neutral, the idle drops from 850 to 500 - 600 RPM. My code reader isn't throwing any codes, so any suggestions are greatly appriciated. Thanks.
No carb since it has TBI. Has new plugs, cap, and rotor. Plug wire test good on my Ohm meter.Fuel filters are new since the truck doesn't have more than 15,000 miles on it. Also, I don't run additives, because most just cover up problems.
 
Try a minor tune-up plug's and filter's, If that is still happening, put some z-max in your gas tank, running that should help out.There are many thing's that could cause that problem, Bad spark plug wire's, bad distributer cap and rotor, plug's, and a dirty carb.(inside the carb) Try the minor thing's first and see where it take's you.
 
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