Scott at Team Harco

I agree with Dan - a proper diagnostic is in order.

The fact that you have intermix (oil in the coolant, and possibly the reverse) - you really need to flush the oil and coolant systems, at the very least. There are serious consequences if this was not detected early.

jwolfe

Hey everyone. I wanted to give a final update (hooray) for anyone who searches/reads through this thread in the future.

After taking the car to my regular mechanic we were able to solve the issue. The throttle body needed to be resealed after a smoke test, that was partial blame for the sluggish driving. The main issue turned out to be the throttle position sensor. It had a lot of liquid inside (water/oil) and it was causing faulty readings, hence the sudden jerking/loss of acceleration. All is fixed and the car runs great the first few drives.

Thank you to everyone who chipped in and tried to solve the mystery!

Dan Martinic

Thanks for following up: it's always neat to hear what ends up being the issue