Question about 1994 Pontiac Sunbird

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1994 Sunbird 3.1,3 spd auto trans. Have to give gas pedal to start,then rpm goes to 15-2000 rpm. Put in drive,idle drops to 1000. Start off,engine spits,sputters till warm. On hiway driving at 50mph w/ steady footfeed,trans keeps cycling bak and forth fr 3rd to 2nd.Also need to bak off gas pedal to shift into 3rd at 45mph where normally it was 40mph. When stop,idle will flux about 100rpm. It did drive normal one time and then went screwy.Changed tps, idle vlv and fuel press reg. Scanner gave no codes! ???

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Have you check the mass air flow sensor? and have you check the fuel pressure? let me know so i can further assist but if those check out the computer maybe faulty..

let me know and i can help further

Posted on Feb 08, 2010

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Posted on Jan 02, 2017

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