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Schrade · 05-19-2014

I'll take a stab here...

Plug in DataMaster, do incremental throttle increase with the throttle stop screw, and I guarantee you get the lope @ 1.6% Throttle Opening, until 2.4% TO, which Marc H says ALL LT5's have.

That COULD account for this:
"When I start the car cold, it settles down right away but seems to idle a little roughly."

and this:
"Lastly, when coasting to a stop with the car in gear, it seems to "surge" slightly."

TB secondary butterflys might also be letting in some UN-accounted for air, exacerbating the lope, and confounding diagnostics ...

WOT performance almost never tells anything of substance in any car...

05-19-2014	#2
Schrade Join Date: Dec 2012 Location: NC Posts: 1,783	Re: Next up: a miss and a "surge"... I'll take a stab here... Plug in DataMaster, do incremental throttle increase with the throttle stop screw, and I guarantee you get the lope @ 1.6% Throttle Opening, until 2.4% TO, which Marc H says ALL LT5's have. That COULD account for this: "When I start the car cold, it settles down right away but seems to idle a little roughly." and this: "Lastly, when coasting to a stop with the car in gear, it seems to "surge" slightly." TB secondary butterflys might also be letting in some UN-accounted for air, exacerbating the lope, and confounding diagnostics ... WOT performance almost never tells anything of substance in any car...