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Q: how to fix choke problem with 1994 isuzu trooper on 1994 Isuzu Trooper

Hello
I have trouble starting the engine on my trooper when cold, once it starts and warms up, if i press the gas pedal in park or neutral, it feels ok, but once i put it in drive, and accelerate, it would choke and sometimes it would even back fire thru the air intake, not the exhaust, until it reaches 2000 rpm, then it feels o.k.
Also the gas consumption is increased almost double that it used before.
I put in a new TPS, spark plugs,and wires, and clean the ideal air valve.
Please help.
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