Bought this used a few months ago - I think is sat a few years before
1991 S-10 4.3L TBI
has new O2, TPI sensors.
Had a "tune-up": plugs, wires, EGR cleaned
Vac is good (dealer checked)
Timing light looks good (about 10BTDC and advances fine).
Gas tank was improperly installed (fixed) - seems likely new fule
passed inspection, has no codes set, but runs like crap. It isn't
It hesitates badly, lacks power and chuggles a little when cruising.
Known problem: Temp sensors (could that do it?)
Also: I belive it sat for a long long time before I bought it. The
water was very rusty and had to be flushed >10x to get it to stay
green (still rusty too). This is why I haven't yet replaced the temp
The cat-conv. is also very old (but doesn't backfire, etc).