shastylz

I have a 05 scion xa manual transmission and i just replaced the spark plugs dues to them being worn and right amount of mileage to replace them and before i replaced them i had a hesitation upon acceleration in 3rd gear only so i pulled the plugs put in brand new iridium toyota plugs and now i still have the hesitation in 3rd upon acceleration almost like its a misfire again i have the mass air flow sensor did'nt help i have cleaned the complete fuel system still have the problem and no check engine light on either so im confused on what it might be.

jct

carbon build up?

seafoam it!!!

shastylz

well i seafoamed it and it didnt help now it is hesitating in second and third. but it is not the clutch slippin so im kinda confused on what it might be would a o2 sensor on its way out cause that without a check engine light on?

shastylz

how should i use the sea foam in the gas tank or oil crankcase or thru the pcv system

shawn61

I would suggest that you can search in the net about it.