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Re: 89 s-10 2.5L runs rough, occasional backfire
On mine I think there was an adjustment screw on passenger side of carb, bottom, in behind throttle mechanism, hard to see or get at. I think I had to use a 2" slot screwdrivr for it.
I presume you have looked at where your choke valve is when cold and warmed up. Being sure the vacuum lines everywhere have no leak, allowing full vacuum and vacuum timing advance ?
Choke adjust is 3 screw round black thing on driver side of carb. My tab is aeound 2 or 3 oclock position. Mine was sticking once so i opened that to inspect and lubricate coil spring.
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1983 S10 4WD carbed 2.8L automatic w A/C
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