Question about 1998 Ford Mustang

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Car surges and is sluggish with AC on.

1998 mustang. My car has been very sluggish recently when the AC is on, and while cruising in 5th gear on the freeway it sometimes surges. The RPMs don't go up, it just seems to briefly surge forward.
This has all been happening after getting my transmission rebuilt and clutch replaced. also the speedometer is dead, could that be causing the problem?
I havent had the time to take it back to the shop, I need to know if the problem is related and if it will cause any problems while driving.

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  • lvi56 Jul 24, 2009

    It's a V6. I had the speedo fixed once, it was the gear. Had the car back for a day and it died again.

  • lvi56 Jul 24, 2009

    I never had the problem before the transmission work. On acceleration with the AC on, it's really sluggish to get going. With the AC off, there's no problem. And only with the AC on while on the freeway at a steady speed it surges, its very noticeable but subtle...if that makes any sense. Again, there's no change in RPM when it happens.

  • lvi56 Jul 24, 2009

    I have not changed my spark plugs or wires since having the car (about a year and a half). I'll check them out and see. How do the plugs affect the A/C or vice versa?

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  • Ford Master
  • 6,674 Answers

First of all, your speedo is probably a result of something they forgot to do, at transmission, such as hook up sensor or cable. Are you sure you didn't notice same feeling before that repair?
When was last tune-up? What engine?

Posted on Jul 24, 2009

  • Mike Butler
    Mike Butler Jul 24, 2009

    A tune-up will insure best chance of eliminating that little surge, but in all honesty, just about every, if not every automobile with a 4 cyl & 6 cyl. engine, experience that. Th AC coming on & off draws a fair bit of engine horsepower, and on 4 & 6 cyl engines, you'll usually feel that.
    My little 4 cylinder I had, I used to shut AC off when I was getting ready to pass, just so I had the extra power available just in case.


  • Mike Butler
    Mike Butler Jul 24, 2009

    P.S. Many manufacturers have a set-up that will automatically kick out compressor on full throttle just to eliminate lack of power & causing a dangerous situation when passing etc.

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  • Expert
  • 202 Answers

When they rebuilt your transmission they didn't hook back the speed sensor to the connector. I think the problem with the A.c is something else your spark plugs cables might need change and spark plugs too

Posted on Jul 24, 2009

  • Ottoniel Jul 24, 2009

    i think you need to change your spark plugs and cable, this will help, when was the last time u changed your spark plugs

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