my mechanic/ brother replaced the spark plugs last weekend, i drove it for the first time yesterday and the vehicle is NOT driving properly - once i reached 50mph i heard a loud clicking noise coming from the hood area. my brother who is also my mechanic said it could be the catalytic converter but i don't believe that. although i am not a mechanic i believe that he may have done something wrong because i do know that changing the spark plugs is pretty tedious/ labor intensive on this vehicle and you absolutely have to know what you're doing and this was his first time doing it. i'm having a diag in the morning but in the meantime has anyone out there experienced anything like this before??? thanks!

 

Which plugs and are you getting a CEL?

Salim