falling on its face while decellerating when i lay the throttle on again approx 3000r

[VikingTrad3r]

paul, did u install new o2 sensors? change?

Originally Posted by Paul Workman

Same exact issue here: 1) Secondaries deleted.

Just spoke to Marc and there is no solid answer (yet) to the issue, EXCEPT possibly changing to a different set of O2 sensors (quicker to react).

I concur with his characterization of the problem:

1) secondaries deleted,
2) deceleration between ~ 1400-2000 rpm
3) stutter/lurch when back on throttle*
4) does not happen when decel below 1400 rpm (e.g., urban type driving)

The cure is a work in progress, according to Marc. Doesn't do it all the time, just a nuisance but seems more often when decelerating from high speed, w/ or w/o clutch engaged. (And, from personal experience, hot/humid days or at high (mountainous) altitudes it occurs more often)

Marc just gave me an O2 part to try (I'd rather not say in case it isn't a cure) and to get back to him if it affects this issue. (The issue is worse on the 93-95 MY cars, Marc says. However, my wife's 91 cammed ZR-1, also with SPTs deleted does NOT display the problem that I'm aware of.)

More on this after I get the new O2s.