Intermittent bucking on highway when accelerating
#1
06-29-2022, 12:29 PM
Intermittent bucking on highway when accelerating
I have a barn find 59k mile 1990 SWB in Colorado Silver. Some days when driving for 1 to 2 hrs the engine drives like a dream. Excellent acceleration. No power issues. Other days, it will drive fine for 1/2hr and then start bucking. like the power is on, then dead and buck, on, dead and buck. It will buck when the accelerator is pushed. If I let off the accelerator it is fine. Today, 10 minutes into my drive at about 75mph, it was bucking very hard and constant. When I let off the accelerator there was still now power, then it came on, then constant bucking, then dead, I thought I was going to have to park it. Then it was fine for the last 20 minutes of my drive with no power issues no matter how hard I accelerated.
It reverberates through the whole driveline and I'm afraid it would do damage to the differentials. Doesn't matter what gear the trans is in so i don't think it is a transmission issue.
I am half way through my 2nd full tank of gas. I don't think it is water in the tank.
I am tending towards the ignition and have ordered a new coil, capacitor, Distributor Amplifier module, wires and plugs. Was going to start here and then have the Distributor rebuilt later.
Has anyone had similar issues? And what were findings? or what are your thoughts?
It reverberates through the whole driveline and I'm afraid it would do damage to the differentials. Doesn't matter what gear the trans is in so i don't think it is a transmission issue.
I am half way through my 2nd full tank of gas. I don't think it is water in the tank.
I am tending towards the ignition and have ordered a new coil, capacitor, Distributor Amplifier module, wires and plugs. Was going to start here and then have the Distributor rebuilt later.
Has anyone had similar issues? And what were findings? or what are your thoughts?
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