I wanted to pass this along and maybe save someone a little trouble. My '90 NA Z was stumbling and hesitating real bad. I couldn't find the problem.

Then the transmission died and while working on the tranny the shop found I had a defective throttle position sensor. They replaced it and no more hesitation or stumbling! Now my car runs like a bat out of... well, you know what kind of bat I'm talkin' about!

The part was $159.00 (only $39.00 wholesale!!!) Hope this helps someone.

Johann