Copper/iridium plugs

I replaced the copper plugs with the correct ones. The car is still not running well at all. Today I put the car on ramps to look underneath. To be honest with you I absolutely have no clue what I am looking for. I had it towed to the dealer ship to be put on a machine, they charged me $65.00 to tell me that on the computer the car does not read out anything, but they had no problem taking an extensive look at the car for $75.00 an hour, then when they find the problem it will be $75.00 an hour not including parts or labor. Needless to say I had the car towed back to my house that day. I have put well over a grand in this car, in parts in labor. Please help me I am at my wits end.

I replaced the copper plugs with the correct ones. The car is still not running well at all. Today I put the car on ramps to look underneath. To be honest with you I absolutely have no clue what I am looking for. I had it towed to the dealer ship to be put on a machine, they charged me $65.00 to tell me that on the computer the car doesn't read out anything, but they had no problem taking an extensive look at the car for $75.00 an hour, then when they find the problem it will be $75.00 an hour not including parts or labor. Needless to say I had the car towed back to my house that day. I have put well over a grand in this car, in parts in labor. Please help me I am at my wits end.