When i did my header install my friend accidentally broke one of my new plugs so i had no choice but to put one of the old ones back in could this be why my car is running weird??

 

running wierd??? We need more info what exactly is it doing. If you just did a header in stall it is most likely one of your wires. Check them all to make sure they are not touching any of your headers and they are not burnt through.





Good Luck!

 

well none of my wires are touchign or burnt. and it just seems to run kinda rough like around town not at wot but lets say if im going 25 and press the gas quarter of the way has a hesitation any ideas?

 

get a new plug and find out. Honestly i would go with a bad wire myself. How bad was the plug you re-used?