Ac blowing hot air keep adjusting hot cold knob then finally a good rap on top of dash then I get cold air

Just got tune up, change gas filter, new electronic distributor. ... now truck pings when it warms up. Any suggestions.

2.3/4 cylinder has oil
in my spark plug well

I have oil on plugs and wire

My spark plug wires and spark plugs are cover in oil

I've replaced upper lower a arms, new ball joints, tie rod ends, wheel bearings, front end aligned, new tires. Nothing helped.....please help

Had upper and lower ball joints replaced and stabilizer bushing replaced , truck has 230000 miles

I replaced the fuses and the lights and the brake switch but they still aren't working and now it won't let me take it out of park so I cant even drive it does someone know what that could be