Buick Repair Questions? Ask a Mechanic for Answers ASAP
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first, it could be a clogged cat converter. that would not let the motor breathe.
low fuel pressure would also do this.
timing may also have jumped.
timing sounds about right.
check the vacuum under a load. remove the o2 sensor and se if it runs better
check the fuel pressure.. low pressure system. 9-12 lbs
you will need a t fitting off the fuel filter
try driving it and see if it has any power
ok, I would try unbolting the front pipe from the manifold and try driving again. the hole for the o2 sensor is small
ok, check fuel pressure and I would also do a compression test