LT1 Optispark/timing issues

[barno68]

well, the intake valves don't need to be open if the IAC is working. What I would try though is cracking the throttle body open just a hair and see what happens. You can use your hand or use your foot from the driver's seat. At this point, you need to do something that causes a change even if it doesn't start. If it's a repeatable change that's even better.

I opened the throttle body a bit and cranked it over, no change that I could note in anything.