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  #151  
Old 07-23-2014, 03:50 PM
AltonHargrave AltonHargrave is offline
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My truck did this bucking for years. It is a 1992 F150 5.0L with automatic transmission. It turned out to be transmission shudder. It felt like it was going over railroad tracks sometimes. This is caused by old transmission fluid and is easily remedied by changing at least most of the fluid like I did in a filter change or buying one of the products out there that cures this. I think one of the most talked about is Dr Tranny's Shudder Cure. You just run it down the dipstick tube and there you go.

Don't try drinking this on a cold day. It is poisonous I am sure.
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  #152  
Old 07-23-2014, 04:30 PM
bobschultz bobschultz is offline
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I should have mentioned that mine is a 5 speed. The bucking is at low rpm's like some of the others but I have changed my trans fluid awhile back.
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  #153  
Old 07-23-2014, 04:41 PM
AltonHargrave AltonHargrave is offline
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I had a 1988 F150 with the 4.9L, a few years back and it started jerking. It turned out to be a bad TPS, throttle position switch.
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  #154  
Old 09-01-2014, 03:09 AM
spike150 spike150 is offline
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Hi I'm new to this site. But I have a little helpful advice . I too have had this same problem and tryed the EGR fix. This fix for me took care of the issue at the time but only to pop back up 6 months later. Now the truck has a start n stall problem. This only masks a deeper issue. Truck is a 91 f150 with 4.9l l6 and e4od auto trans
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  #155  
Old 09-01-2014, 03:38 AM
spike150 spike150 is offline
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Need some help
My 91ford f150 4.9l l6 still has starting issues and I'm at ropes end here. It will start right up run perfect for 3-5 sec and then it sputters and dies. I can keep it running by fluttering the gas pedal a little.
This is what I've done so far:

New part include:
Complete distributor (brand is WPS)
Plugs ,wires + new coil
New o2 sensor
New MAP sensor
Starter and solenoid
(Long story timing was a little off)

Also checked fuel pressure (koeo 49psi koer 50psi and for unhooked 60 psi

Hope someone can help me out Thanks for the help in advance
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  #156  
Old 11-18-2014, 12:26 PM
Mike8087 Mike8087 is offline
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This truck I bought 1990 F150 4x4 has been setting for 3 years. I rebuilt the engine. I have tried every thing I can on my F150 300 6. New ideal air control valve, new idle control, plug and wires, disturber cap and rotor button. Throttle body gasket was broken and replaced it too. I took out every injector and cleaned them. I have a jerking and jumping in it about 1200 rmp driving me nuts mash it on down and it runs fine. It will idle some times and die some times. My smog pump locked up too. It was doing all this before the smog pump locked up. I will try plugging the egr line to see what happens. Thanks for the info.
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Old 11-18-2014, 12:26 PM
 
 
 
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