This hasn't happened to me in years, being stranded by a SC. Really hasn't happened to my much at all, but it happened today.
Here's the whats-what. Fraser's old car has been running good, not great but good. I'm getting poor gas millage, but that is most likely because I asked Fraser to "de-tune" it for 89 octane. After drives when the car gets warmed up, I get the ever frustrating "hot start" issue. Which I still haven't got nailed down yet. That's not today's problem(at least I don't think it is).
After starting the car, and clearing off all of the snow I start my drive to work. The car needed one blip of the throttle while clearing the snow off. That has been normal for this car, it won't stall out, just the idle drops very low, and the car fights to stay running. One blip and all is good after that. So I do the short drive to reach the on ramp, get onto the highway, no issues. After maybe 1-2 minutes of 100 km's(1800 RPM, 5th gear) driving the car starts to BUCK, I quickly push in the clutch, the bucking is not in the drive lina, as I can not feel it after clutch is depressed. I look at all gauges, no CEL or upshift light. Aftermarket oil pressure is still reading 58-60. Wideband is reading between 18-20(that's what is stays at while cruising), tach is working, but I can see it jumping up & down in a range of about 400 RPM. No smells of coolant threw the vents, or burning oil anywhere.
I pull off the highway, and limp back home, with the car bucking with any type of throttle, I never even tried WOT for the bucking reasons. Got back home, pulled into he driveway, guess what, bucking was gone.
I 1st thought I broke the balancer, until the bucking went away when I got home. It could be on it's way out, or the bolt has broken off. Yesterday I filled the car with gas, it was VERY empty, and I had it sit all weekend with no gas in the tank. It could be the fuel pump(as I don't the age of it, or what one is there,stock or bigger). I know I could have picked up some crap with the low gas level.
Without the CEL, or upshift light coming on, I'm sort of lost as to what this could be. Taking the morning off to see if I can find the trouble.
Any input would be great guys, thanks.