Minor Jerking.....
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Senior User
Joined: Sep 2004
Posts: 208
Likes: 0
From: Lexington Park, MD
Minor Jerking.....
I have noticed some minor jerking(missing?) in the motor when the RPM's are 1500 or less. I just replaced the TPS a couple of months ago and I am thinking that it might be the voltage. thanks.... by the way it is a 90 F150 5.0L
Mountain Pass
Joined: Jul 2004
Posts: 245
Likes: 41
this type of bucking occurs in the 300 six too. right around those same RPMS. some people reported that replacing the throttle body gasket relived this issue. it seems the stock gaskets on these years tend to get weak and let additional air past the throttle.
Junior User
Joined: Apr 2004
Posts: 73
Likes: 0
From: Hillsboro, OR
Could be a vacuum leak in the lower manifold gasket or the throttle body shaft seals. 90f150.0l, do you have a plumers propaine torch? They are cheap if you don't. use it unlit in these areas and see if your rpms increase.
