Just want to say im new here and would really appreciate your help. I have a 1993 Chevy Suburban 1/2 ton 5.7 liter. It idles irratically and has a ping on the passenger side that stays there even when i turn the truck off. ive done the basic tune up plugs, wires, some sensors, egr valve (because i had a code come up saying egr valve was bad) the sensors i changed out were temp sensor and tempature switch.Put a new air filter on also. Major parts i changed were radiator water pump and hoses. truck ran fine until i changed these things. i have no clue whats goin on no codes are comin on. all help would be appreciated. its a awesome truck my family truck. Heres a pic for your viewing pleasure.