4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

Acceleration is hesitent.

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Old 03-26-2009, 04:05 PM
  #1  
hyawatha15
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Default Acceleration is hesitent.

I've had my car for over a year and a half now and it has been running great. I took it out of storage about two weeks ago and its been giving me an acceleration problem. Originally, I couldn't get the car started when trying bring it out of storage because the fuel pump had gone. I replaced that and now the car feels jerky when I accelerate in 2nd, 3rd, 4th, and 5th gear. Its more noticable in the 3 higher gears and at lower RPMs (around 1k to 1.7k). I can't feel the jerkiness after about 1.8k RPMs.

I thought it might be bad gas so I replaced all of it with new fuel and its given me the same problem. The clutch seems to be working fine. Putting it into any gear works like brand new.

Any insight on what this could be would be helpful. Thanks.
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Old 03-26-2009, 04:43 PM
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lilc1511
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no codes? what mods do you have? fuel filter? also check your air filter, while it was in storage a mouse may have seen fit to build a bit of a nest.
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Old 03-26-2009, 07:14 PM
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hyawatha15
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It has a MAC cold air intake, unknown after market exhaust (sounds nice ) and a short shifter. Other then that, I think everything else is stock. When I got the new fuel pump installed, there were no codes showing up, but I'll double check on that. I'll check out the fuel and air filter. Thanks for the reply man.
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Old 03-26-2009, 10:22 PM
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lilc1511
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Originally Posted by hyawatha15
It has a MAC cold air intake, unknown after market exhaust (sounds nice ) and a short shifter. Other then that, I think everything else is stock. When I got the new fuel pump installed, there were no codes showing up, but I'll double check on that. I'll check out the fuel and air filter. Thanks for the reply man.
np, while your under the hood i would check the MAF for cleanliness and just look in the TB for the hell of it.
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Old 03-27-2009, 12:44 AM
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MineralGrey
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^ +1 just use an electronics cleaner on the MAF see if that helps.
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