How do you set the timing on a 1997 Chevy 305 v8?
You cant set it manually, its electronically done by the
computer so its always right. If you have a driveability problem
suspect something else (fouled spark plugs, dirty injectors,
clogged fuel filter, weak fuel pump, bad fuel pressure regulator,
low compression, etc), but if you're certain its the timing then
varify the crank and camshaft position sensors are both working
correctly. Also check the timing chain, if its worn enough to jump
time and your camshaft is improperly syncronized to the crankshaft
it won't run well (if at all).