Other day I got on the gas and it sputtered and seemed to backfire.
Backfired out the exhaust or the intake? IAC reading on the handheld?
Be pretty hard to backfire out the exhaust, that would be a misfire.
back·fire
/ˈbakˌfī(ə)r/Submit
verb
1.
(of an engine) undergo a
mistimed explosion in the cylinder or exhaust.
"a car backfired in the road"
synonyms: misfire
"the engine backfired"
Farting out the tail pipe isn't a mistimed issue. It's a no fire issue and some other cylinder's residual exhaust pulse is igniting the air/fuel mixture. As evidenced by the OP's findings.
Coughing out the carb is a mistimed event.
Two different things.
