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#1
December 27th 08, 01:36 PM
posted to rec.autos.makers.ford.mustang
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Stumbles under Load
97 4.6 Mustang 75k. after warm up, stumbles under load. what would
be your guess? replaced ignition wires; plugs replaced year ago. 
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#2
December 27th 08, 03:16 PM
posted to rec.autos.makers.ford.mustang
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Stumbles under Load
On Dec 27, 8:36*am, bill > wrote:
> 97 *4.6 Mustang 75k. *after warm up, stumbles under load. *what would > be your guess? * replaced ignition wires; plugs replaced year ago. Really too much to guess about, but here's my guess: Is the check engine light (CEL) on? You probably would have mentioned it if it was on, but have the codes read even if the CEL is not on. As to your plugs and wires...did you use Motorcraft plug wires and Motorcraft or Autolite plugs? Those are the only brands I would use in a Ford. The plug wires are more expensive, but worth it. Did you ever replace your fuel filter? From there, I would look at he O2 sensor and the MAF. After that, it's a big reach, but fuel injectors would be on the list also.
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#3
December 27th 08, 04:19 PM
posted to rec.autos.makers.ford.mustang
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Stumbles under Load
bill wrote:
> 97 4.6 Mustang 75k. after warm up, stumbles under load. what would > be your guess? replaced ignition wires; plugs replaced year ago. Air filter, fuel filter and clean the thermistor in the MAF.
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#4
December 27th 08, 04:40 PM
posted to rec.autos.makers.ford.mustang
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Stumbles under Load
CEL was not on and auto zone checked the code---none. fuel filter
never replaced. thanks On Sat, 27 Dec 2008 07:16:02 -0800 (PST), Kruse > wrote: >On Dec 27, 8:36Â*am, bill > wrote: >> 97 Â*4.6 Mustang 75k. Â*after warm up, stumbles under load. Â*what would >> be your guess? Â* replaced ignition wires; plugs replaced year ago. > >Really too much to guess about, but here's my guess: >Is the check engine light (CEL) on? You probably would have mentioned >it if it was on, but have the codes read even if the CEL is not on. As >to your plugs and wires...did you use Motorcraft plug wires and >Motorcraft or Autolite plugs? Those are the only brands I would use in >a Ford. The plug wires are more expensive, but worth it. Did you ever >replace your fuel filter? From there, I would look at he O2 sensor and >the MAF. After that, it's a big reach, but fuel injectors would be on >the list also.
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#5
December 27th 08, 07:41 PM
posted to rec.autos.makers.ford.mustang
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Stumbles under Load
Gill is on the money... clean you MAF!
K. "GILL" > wrote in message ... bill wrote: > 97 4.6 Mustang 75k. after warm up, stumbles under load. what would > be your guess? replaced ignition wires; plugs replaced year ago. Air filter, fuel filter and clean the thermistor in the MAF.
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#6
December 29th 08, 12:05 AM
posted to rec.autos.makers.ford.mustang
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Stumbles under Load
"Kate" > wrote in news:1vv5l.13222$YU6.2749
@bignews8.bellsouth.net: > Gill is on the money... clean you MAF! Intake leak can cause this.
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