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Does that engine have the platic vaccume lines on the EGR solonoid? IF so you might as well through those in the garbage and use "old-school" vaccume hose. I know my former 92K1500 with 5.7 was very senstitive to base timing. It had to be at zero degrees.....nothing less, nothing more.
Came across somthing different the other day...friend had cylinder heads rebuilt on 5.0 vortec...never could get the idle right....turns out intake gasket was leaking internally (to the lifter valley). I assume you have no trouble codes?
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1986 FJ60
5.7 Vortec
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