i need help with a car that isn't a supra...

[91blackeye]

i was getting ready to drive my 73 celica to los angeles, had a buyer for it... then it started bucks and sputtering, backfiring. literally out of effing no where. i am pretty furious, and no one else is willing to help me. you guys are a lot more helpful here, so i am hoping someone maybe has some advice to offer? my sparkplugs are fine, plug wires, and it runs fine at idle, even in nuetral, i can drop the pedal all the way, and it is fine. only when there is a load on the engine does it act up, and it is getting worse. it started yesterday as being bad only while i tried to do some heavy accelerating, now it does it pretty whenever the hell it feels like.

HHHHEEEEEEELLLLLP!!!!!!!!!!

 

[Tango_hotel]

Is it stock? Is it carbed? Just from the info you posted I would check the fuel filter- you might have got some bad gas if it was sudden with no warning signs beforehand.

 

[Neodeuccio]

I agree, check the fuel system first.

 

[zachm611]

fuel filter or fuel pump...even carb could be messed up

 

[tlo86]

bad cat could also cause these i believe / blocked exhaust