hi my 90 240 sx is running really bad the car dont want to idle or run if you floor the gas it jumps back and forth between 2 and 2 1/2 just replace the tps and o2 sensor anything else that could cuse this please help

 

EGR valve maybe.

 

thanks is there a way to tests it before i buy one

 

just replaced the egr valve better but still not good sounds like a little bit of a backfire but im not for sure

 

it could be your egr control solenoid valve i had to replace mine i payed $17.50 CDN from a junk yard.

check it out.

 

here is a pic so you know where it's located, it's on the upper left.