At 45 to 50 mph pedal down 2000 Daewoo Nubira runs rough, let off pedal smooths out
I was just on an 11 hr highway drive and used cruise control a lot. The left wheel heated up and I got a new brake hose and caliper. Just checked alignment and speed balanced the wheels, Firestone said the tires did not seem to have a bad belt when on the speed balancer. No scan codes come up using the small auto parts store scanner. Firestone says they have an advanced scanner for a $99 test and it might show misfires in certain cylinders. I guess I should do the least expensive stuff first, like maybe a fuel filter, then what to try, something like a cam position sensor? It runs great up to about 40 mph. And when it starts running rough and vibrating a 45mph when accelerating, it smooths out when I get off the gas.