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#1
12-01-2004, 07:42 AM
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Hesitation after idling in gear....HELP
96 Metro 4cyl automatic...The engine stumbles and hestiates if I idle in gear for a minute or so (like waiting at a red light) Otherwise the car seems to run fine. Plenty of mid to high-end power (for a Geo) Stop and go traffic is no problem, but a short wait at a light causes the problem (BUT NOT ALWAYS)
I replaced the Platinum plugs with regular plugs (.039 gap) and the problem disappeared for about a week. It seems like the car is either starving for fuel or trying to flood out when I start off, but then recovers and runs great. New plugs, air filt, fuel filt, rotor, cap, no codes or light. Right now i have premium gas and Lucas Fuel Treatment in the tank. I'm thinking next is plug wires, fuel pump, or a timing issue unless you guys can tell me otherwise. 
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#5
12-03-2004, 12:25 PM
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cbuck - how did you determine it was the tps? Sounds similar to a problem with my 93 conv. 1.0 A/T. Last price I saw on them was just over $100. Too expense for just guess and swap venture.
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#6
12-06-2004, 07:21 AM
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Three mechanics told me it was the TPS. $129.99 USD was the best I found (Autozone) part # TPS486. I replaced it but now have a slightly different problem, so it is probably something else that caused similar symptoms. The TPS is a 5-minute repair when it IS the problem, but I'm still looking. I'll post back when I get it solved.
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#7
12-13-2004, 07:22 AM
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It turns out the EGR Valve was bad. It tested out OK, but when I took it off to check for blockage, I found that the internal valve seat was bad, letting the exhaust blow by. I replaced the valve and the car is fine now.
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#8
12-24-2004, 12:45 AM
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Re: Hesitation after idling in gear....HELP
I had the same exact problem.
'96 Geo Metro 1.3L, 4cyl., automatic. Hesitation sometimes at idle but not always. I replaced EGR valve and works fine now. One of the ports, the one with the larger hose was so blocked I could not clean it. Also, check the ignition timing.
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