I just finished an oil change and now my car idles crazy!! it fluctuates between 1500 rpm and 2000 rpm. all the while, my oil pressure gauge fluctuates between 70 psi and 55 psi at idle!! also, the A/F gauge goes from rich to lean. its almost like if ur milking the gas then letting go.
some key info: i connected my oil pressure gauge to my golden eagle sandwich plate this oil change. this is the first time also, that i switched from full synthetic mobil 1 to part synthetic castrol. before this oil change, my idle was always at ~2k rpm but thats because im having some other problems. so can someone please tell me whats wrong with my car??