Bucking at constant speed? Options

[6GenCircleLghts]

After I've been driving for 10 minutes or so and I'm going down the road in 4th at 35mph with my foot barely on the gas pedal. I don't get massive bucking but enough that it annoys the hell out of me. It also happens when I'm in 3rd going 25mph and 5th going 45 to 50mph. Two main things that were replaced were the timing belt and distributor. Though I got the distributor replaced a couple months after the timing belt and that is when it started happening. Would it be from the distributor or what? The timing belt and distributor was done by a professional mechanic. I did the starter by myself, plugs and wires, but these were even before the timing belt/distributor.

[terbear4god4life]

could be a gas problem,pump,filter??

[AnaXyd]

What exactly is "bucking"? Maybe I got the same problem as you, if I have understood you correctly.

[Nartanian]

The bolt holding the distributor might be too loose. I had the same issues after a head swap. The car keep bucking when you slightly tap the gas pedal. As I was driving one day, the distributor just popped out. So make sure the bolt keeping the distributor attached it tight.

[6GenCircleLghts]

AnaXyd - I'll try to take a video for ya. And then post it.

Nartanian - I really hope it is just the distributor, that would fantastic!

[95CelicaST]

If I am understanding "bucking" properly, are you referring to the car misfiring under acceleration? Or bucking because you need to downshift?


Check your plugs, and if you replaced your wires with non-OEM I would recommend going back to OEM.

[DGAF]

I could be a misfire. But then again the way you describe how you do 35 in 4th gear by barely touching the gas pedal I think that it's just like 95CelicaST mentioned. You may just need to downshift and problem solved.
but you mentioned it happened after the timing belt replacement. Maybe the mechanic who changed the belt adjusted the timing on the distributor and that could have caused it for you to notice the difference right after the timing service. I would just double check it with a timing light just to make sure it's on point. but then again it could also be your driving... Good luck and hope you find a solution to this issue

[KAOS]

Have you checked your codes?
The CEL doesn't always come on. And when my car started 'bucking' (usually on the highway/long distances) I found it was the throttle position sensor... and oddly enough I too had just replaced my timing belt/head gasket...

[Nartanian]

If I am understanding "bucking" properly, are you referring to the car misfiring under acceleration? Or bucking because you need to downshift?


Check your plugs, and if you replaced your wires with non-OEM I would recommend going back to OEM.

It can't be because he needs to down shift. For one, I'm sure he hasn't changed his driving style since he took it to the shop, and 2, if you are in a to high gear slightly tapping the gas pedal doesn't generate as much "bucking" as it would going WOT throttle.