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So when I'm driving around, and specifically when it's humid as I've noticed, my car will randomly lose power and when at a constant speed, start lurching back and forth. Every time this happens, all I have to do is put my foot to the floor in 1st, 2nd, or 3rd and power will come back in a jolt and it'll ride smoothly at constant speeds until it decides to do it again. The idle RPM will also drop to around 500 rpms when this happens and you can smell gas/burning while stopped. Any ideas?

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  • Welcome to Motor Vehicle Maintenance & Repair! Sep 22 '18 at 16:37
  • Which engine is in your Mustang? Sep 22 '18 at 16:38
  • 3.8 1998 mustang Sep 22 '18 at 17:01
  • My thinking is you might have an issue with the throttle position sensor (TPS), but with it being intermittent would be hard to prove. You might be able to catch it when the issue is happening. The "typical" way to check it is to transition the throttle while from closed to FOT while watching the throttle %. It should be smooth all the way across. If there's any stops, where the % stays then jumps, this would indicate an issue with the TPS. Sep 22 '18 at 17:14
  • Hmmm, I see. I'm guessing I'd need an OBDII sensor again. I've also heard that it could be my MAF sensor since its intermediate. The gas smell makes me think it's a leak but a leak wouldn't cause intermediate problems, right? Do you think the TPS would cause the gas smell as well or am I looking at 2 problems instead of one? Sep 22 '18 at 17:20

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