88 mustang 5.0 ho starts and idles fine but in in gear drives rough - MustangForums.com

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88 mustang 5.0 ho starts and idles fine but in in gear drives rough

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Old 02-03-2014, 07:55 PM   #1
Join Date: Feb 2014
Vehicle: 1988 ford mustang
Location: Michigan
Posts: 1
Lightbulb 88 mustang 5.0 ho starts and idles fine but in in gear drives rough

'My 88 mustang starts right up no problem stays idle I can rev it up still no issue but on the road it it runs real rough especially from 4th to 5th gear and shakes another thing I have noticed is when I let it sit for a few weeks I take it out for a spin and it drives great. I took it to a shop and they said it's not my trans I already know that I had the whole thing rebuilt this past summer my dad says he thinks it's the fuel filter any suggestions? Also it feels underpowered in some areas but that isn't the case when I let it sit for long periods of time. Any help would be appreciated
88 mustang gt convertible. 5.0 5-speed 100,000 miles on body. 30,000 miles on rebuild. Ported and polished heads, big cam, bbk headers,bbk 70 mm tb, bbk x-pipe exhaust with 2 flow master 40 series mufflers, 373 gears its been lowered a few inches stage 2 clutch,short throw shifter
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Old 03-27-2014, 02:15 PM   #2
87 T TOP GT302
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Join Date: Mar 2008
Location: Mt. Airy, North Carolina
Posts: 156

If it feels like it is skipping, while going up a hill or lower rpm's it may be the coil going bad. I had to replace my years ago .
1987 GT W/T Tops 5.0 With ported/93 COBRA Heads W/1.7 RR . Professional Products intake w/70mm T/B Lunati 501A1LUN cam 272/282 duration and 477 lift but 506 wit 1.7rr 1 5/8 Mac equal length shorty headers W/ 2.5 full exhaust and Flowmaster super 40's, BBK underdrive pullies ,Had 2.73,3.55,4.10 ,and current 3.73 gears with aluninum drive shaft.Just added 24lb injectors.
New just converted to Mass Air -what A Difference. Runs the best ever with NO idle issues.
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