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1983 mustang v6 idling good rpm drops when put in gear

Idling is fine but when you put it into gear the rpms drop and tries to die. also battery and alt both check fine but if you let the car set over night the battery will be dead by morning.

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  • babygirl9138
    babygirl9138 Jan 22, 2013

    Also if it helps any we have changed the igniton control mod, spark plugs, fuel filter, vacuum hoses, oil and oil filter.

  • babygirl9138
    babygirl9138 Jan 22, 2013

    battery and alt is both new and tested both good

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2 Answers

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  • Cars & Trucks Master
  • 1,632 Answers

Replace diode inside alternator ,

Posted on Jan 22, 2013

  • babygirl9138
    babygirl9138 Jan 22, 2013

    battery and alt is both new and tested both good

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  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

Buy a new battery

Posted on Jan 22, 2013

  • babygirl9138
    babygirl9138 Jan 22, 2013

    battery and alt is both new and tested both good

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

pal03246
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SOURCE: idle too high +goes higher when put in gear (manual transmision

IAC valve problem. Nissan has a updated harness (with one way diode inside of the harness) to prevent backfeeding for the IAC valve and a new IAC valve also gets installed. That's where I would look. IAC valve or "idle air control" valve.

Posted on Sep 21, 2008

  • 496 Answers

SOURCE: 87 Supra idles rough and dies out

I would suspect a vacuum leak. At idle under high vacuum the air fuel mix is being leaned out until you have misfiring so bad the engine quits. The exhaust smells rich because even a lean mixture, if it doesn't light off, if full of unburned fuel. At road speeds, the vacuum is low so the engine doesn't care if there is a small leak somewhere. It is getting most of its air through the open throttle. Check all your vacuum lines but remember that even if every line is okay, it could still be leaking from an old cracked intake manifold gasket.

Posted on Jan 28, 2009

  • 74 Answers

SOURCE: The battery drops dead every morning.

It may not be your problem, but you could at least eliminate it. Try checking you trunk light and hood light and make sure they cut off when you close them (if equipped). If not, then you wouldn't see them not shut off, and they'd sit there and drain your battery all night.

It could be other things, but I have definately seen this happen before and you should eliminate it first because:
1. It's easy.
2. It's free.

Posted on Feb 11, 2009

  • 32 Answers

SOURCE: 1997 Jeep Grand Cherokee Stalls when put in gear V8

Replace the throttle postioning sensor, and mass air flow sensor

Posted on Mar 09, 2009

clarktravis8
  • 74 Answers

SOURCE: rocky idle, when in gear no power,slow rpm,backfires in front

In order to resolve this problem you are going to need a different set of plugs even though the smart parts store mechanics say the computer says you need whatever plugs they want to sell you, you need to go with your OEM plugs if not sure call your local dealer and ask the parts dept. what is the name brand and specific length plug you need for your car when a plug is either too short or too long it will cause this problem if they say you have the correct ones then I would check the firing order to ensure the spark plug wires haven't been improperly installed meaning the firing order is off. I noticed you said the plugs were dirty if that was the case and plugs and wires are correctly installed and proper plug then I would have the fuel injectors cleaned try using some lucas fuel cleaner and stabilizer. If you feel wally world put too much oil in check your dipstick on level ground it will let you know if that is the case I would immediately take the car into dealer and have them check the oil pump to ensure it isn't damaged from over working or caused any other damages in your engine take the estimate with explanation of what caused the problem from the dealer to the walmart service manager where you had the tune up done to start the claims process to have them foot the repair cost or for reimbursement and demand a refund .This should get you back up and running correctly. much success and good luck with this. Please Rate Me. And you can always ask me. wutxtye0rjd9d9ekmodqt1eoxkvn9hr9qjz1l3dabggyud7sdgr36czsrfxqenadhnijx9nfayi+sz1sug0aaaaasuvork5cyii=

Posted on Apr 26, 2009

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