Small miss and airlock in cooling system
Just did a quick tuneup to my truck. It had a rough idle and was lacking power
Changed manifold gasket and fixed leak at manifold to exhaust
Changed Spark plugs, wires, dist cap, and rotor
The truck idles and runs better but still has a slight miss
The thing that worries me is that I reconnected the valve cover to airbox hose (previous owner unhooked)and it is getting gummed up with yellowish froth and froth in the oil cap
At first I thought the worst, head gasket, but no froth in oil, coolant level never went down.
Then I thought blowby but there is very little smoke coming out of the oil fill, and no pressure coming out of the cap
Second I changed the thermostat and have a very annoying air lock. I tried letting it reach normal operating temp at idle, squeezing the rad hoses, heat on, heat off etc.
The truck never heated up past normal range but while driving it heats up almost to red then immediately drops back down to normal. The fluid in the overfill stays cold so it is not cycling. I was told by a buddy to leave the rad cap unlocked, while going for a short drive, not off, just not sealed and allow it to boil over . Do you think this will work?
I also want to seafoam the truck, I should have done it b4 the tune up. But it should be ok, I've heard it can foul plugs, but I doubt theres any truth in that. Any feedback?