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Old 12-15-2006, 16:30   #1 (permalink)
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what causes my 4.6 to stumble

i have a 97 mustang gt 4.6 with 157,000 miles on it and it's got a problem where the engine is stumbling if i give it too much throttle. i've looked in my chilton's manual and it says it's either the ignition or fuel system. i've just put new plugs, coil packs, fuel filter and fuel pump on it not too long ago. so what my problem?
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Old 12-17-2006, 13:53   #2 (permalink)
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Re: what causes my 4.6 to stumble

I would try fuel injector cleaner, @ least 2 tanks worth and change the air filter.
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Old 12-25-2006, 10:58   #3 (permalink)
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Re: what causes my 4.6 to stumble

Try your TPS "Throttle Posisiton Sensor". But if its missing on one piston check your spark plugs, and your spark plug wires. Take out each plug and replace them while you have them out. I used to be a true beliver in Bosch products until I had a platinum +4 blow off in my race car.
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Old 01-03-2007, 09:12   #4 (permalink)
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Re: what causes my 4.6 to stumble

I've tried the fuel injector cleaner and it brought the power back up to normal. and I've replaced both plugs and wires and the problem is gone.

thanks for your help
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Old 01-11-2007, 14:29   #5 (permalink)
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Re: what causes my 4.6 to stumble

Ill tell ya your damn problems 1) Ford Sucks 2) Its not a CHEVY
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Old 01-11-2007, 16:16   #6 (permalink)
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Re: what causes my 4.6 to stumble

Quote:
Originally Posted by camaroman
Ill tell ya your damn problems 1) Ford Sucks 2) Its not a CHEVY

Thats some great tech advice from your typical camaro fanatic. Man you just made the camaro comunity look fifty times smarter. here's a hat for you.
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Old 03-11-2007, 10:41   #7 (permalink)
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Smile Re: what causes my 4.6 to stumble

Figured it out, Head gasket leak. Problem fixed
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