Seems to me not to long ago I saw a similar post and I beleive they were pointing in the direction of the crank sensor. Might want to search for a thread on that area.

Good luck
K

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1989 420SEL 105575 miles
Pearl Black/Grey

1990 Chevrolet E-Cab C-1500
293,000 miles

1989 Olds Toranado Trofeo'
132,000 miles