Darkhorse. I'm looking forward to hearing you explanation for stalling and backfiring. As you pointed out, I think we can rule-out fuel pump and vacuum leaks.
Since you probably help many people, I'll reiterate the steps I have taken to date:
-run two tanks of gas with Techron in each
-changed fuel filter
-checked and cleaned plugs
-removed bellow at throttle body and srayed/wiped butterflys (only top showed any signs of carbon - very little)
-one bottle of chemical to dry gas of any moisture
-changed air filter
-checked for vacuum leaks with carb spray, also sound check with short piece of garden hose (used like stethoscope)
-cleaned ICV; sprayed with carb cleaner. Sleeve action in ICV seemed smooth
-While ICV was off, sprayed into throttle body. some carbon build up but not restrictive
-spayed again behind ICV to check for vacuum leak (none apparent)
-driven car at higher speeds for 45-50 min.
-checked fuses connected with fuel (replaced with spares even though fuses were not broken)
-didn't check fuel relay; not sure which one it is or how to test
-changed o-ring for camshaft position sensor (still see leak but it's coming from bottom of wire; not where sensor bolts to the head)
CAR IS RUNNING WELL (smooth/no hesitation). Idle is 750+; and it starts within 3-5 cranks. BUT, the stall/backfire issue still exits. To reanswer your question, the stall that that makes you fell like you're going to go through the windshield, is usually during aceleration (1st and 2nd); but, it also happens while driving at steady speed; and sometimes (but not often) when I let off the peddle. In other words, I can't be 100% specific. But then you probably already knew that -lol. without codes read, will never get to the answer. or do you really think you got the ans?
SOOO, I'm patient. but can't wait to hear ideas on electrical probs. I'm not a betting man, but I sensing camshaft posiition sensor from other threads I've read.