TOYOTA MR2 INTERIOR

Hello, I Don't Know If It Is A Wiring Problem Or If The Problem Is Lighter. Need Help On How To Test And Repair And Asking For...

When Reving Or Driving, At Around 2k To 3k Rpm Tach Needle Jumps And Car Hesitates. At About 4k Rpm Its Smooth. I Have Not Checked Anything...

I Was Trying To Repair What I Thought Was A Lose Wire With The Brake Light And I Ended Up I Think Blowing A Fuse, Now No Blinkers Or Brake...

I Just Bought This Car. The Previous Owner Just Replace The Ignition Coil And The Tachometer And Speedometer Does Not Work.