vx hatch problem...

[vxhatchdelsol]

i have a 93 vx hatch and i cant figure out whats wrong. it idles up adn down a little funny until it warms up so i replaced the throttle position censor and it still does it. also while driving the car if i try to drive at a steady speed under 3000 rpms it bogs out and tries to quit. so i have to drive 60 in 3rd gear at 3000 rpms. does any one know hwat my problem is? thanks much the help will be appriciated.

 

[eg'sforlife]

check your pcv valve and also check and see if your thermostat is stuck

 

[vxhatchdelsol]

ok thanks. i checked and my thermostat i dont think is stuck because the heater works fine adn blows hot air. and the car only does this problem when it gets warm. also the pcv valve is hooked up and not leaking... any other ideas what could cause the car to bog and studder at low rpms while driving? also hte check engine light comes on and then all of the sudden it works fine... but when i start it again and it warms up it starts all over again untill the check engine light comes on.

 

[eg'sforlife]

your thermostat can still be stuck even if the heater works

 

[vxhatchdelsol]

how do i make sure the thermoustat is ok then? also if its not the thermoustat does it sound like its a sensor problem? also the persone who had it before me put a cheap ebay header on it and the o2 censor is put into the number 4 cylender not on the back where they all meet. could this be a problem wehre its only reading one cylender and not regulating the others properly?