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Ask Chris (aka- Moose) Your Own Question
Chris (aka- Moose)
Chris (aka- Moose), Technician
Category: Ford
Satisfied Customers: 47984
Experience:  16 years experience
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1999 ford f250 superduty 6.8 liter 5 spd 4x4 no codes,

Customer Question

1999 ford f250 superduty 6.8 liter 5 spd 4x4 no codes, sputtering after 2500 rpm acts similar to hitting rev limiter. At idle in neutral will accelerate 5000 rpm perfect. Things I have tried 0) fuel filter , air filter, sea foam 1) disconnected each coil pack at idle noticeable miss with each disconnected goes away once reconnected 2) disconnected exhaust before cat conv., no change 3) replaced fuel pump, no change. Also noticeable drop in mpg. Would love some help....
Submitted: 1 year ago.
Category: Ford
Expert:  Chris (aka- Moose) replied 1 year ago.

Welcome, I am Chris (aka-Moose)

When it occurs does it seem to happen when lugging the engine like going up a hill in 5th (OD)?

Does it feel like the engine has the hiccups?

So far I believe one of the coils is weak and not providing a strong enough spark and under certain speeds, rpms, loads, elevation, air fuel mix, and temp that weak spark is not able to fully ignite all the fuel.

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Thanks Chris

Customer: replied 1 year ago.
You could say hiccups, it has gotten worse just since yesterday. It started out lugging on hills. Now any hard acceleration, and some times not so hard .
Expert:  Chris (aka- Moose) replied 1 year ago.

Do you have the ability to have a scan tool connected that can run a power balance test while it is occurring to see which cylinder is dropping out?

Can you monitor the fuel pressure while driving to see if the pressure is dropping when this occur?

Customer: replied 1 year ago.
No, if I had those abilities, I wouldn't have needed help.
Expert:  Chris (aka- Moose) replied 1 year ago.

How do you feel I can help you beyond what I have already mentioned is likely to blame, so you would be pleased with me.