I just bought a 89 GTU, and it wont rev past 6100 rpms, and it missfires at idle and lops a lil, would that be from bad sparkplugs?

Look under the hood. Maybe somebody snuck a five-oh in there without telling you. https://www.nopistons.com/forums/pub...1047683785.gif



Sparkplugs and wires are a possible easy fix and you should do it anyway, seriously though. https://www.nopistons.com/forums/pub...IR#>/smile.png

Definetly change the plugs and wires. That should help out. Drive it again and let us know if that helped.

ok, I will pick up the plugs, from a local kragen, man they charge 5.99 each for the plugs, is that normal?

Yea thats about right. Rotaries use a different type of plug then a piston engine. You will know what I am talking about when you see them.

https://www.nopistons.com/forums/pub...1047683329.gif yeah the NGK plugs are around $5.00-7.00 and the wireset should be less than $30.00. Remember to put anitsieze on the plugs and the boot protector grease. Do a tune up. Change the belts if they look crappy and other necesary items





Good lUck

The only place around my area that had the right plugs available charged like $10 for mine! Pretty harsh.

Your TPS could be at fault as well. Also, check the tube that goes from the air filter to the throttle body for cracks. It wouldn't hurt to change the fuel filter too.

Ok, I got the plugs and wires, and that guy had four leading spark plugs, well anyway, it runs alot better but it still cant go past 6k,

my suggestion is compression test, although its not nice news but you should do that first off! and check for vac leaks, and fuel sys overview

let us know how it goes