I have a 2002 chevy suburban. For about a month I was mysteriously losing coolant and then the car started idling very badly so I took it to a mechanic and I had porous cylinder heads and they fixed that problem a week ago. the car is no longer leaking coolant but running horribly. I was saying random cylinder misfire and now just says cylinder 8 misfire. Someone told me it might be from the previous coolant leak had fouled my plugs. So today I changed plugs, wires on the engine and the coil on cylinder 8. It is still running horrible and since I had it fixed last week I cant afford to take it back for a different problem. Any ideas? The porous heads problem was because bad cylinder heads made by cast tech (or something like that) were put on GM cars and they never recalled or anything.
