runnin rich and a heater issue

[candyman]

So i have a couple things i need help with... first is the car is runin rich, really rich its getting worse gas miledge then my 02 liberty, i jus bought the car and the guy said that he had changed the o2 sensor within the last year so i dont think it is that, i dont have a lotta extra cash so iam trying to pinpoint the most likely cause. the car has an intake, megan header, and 2 1/2" exhaust to the muffler, no cat. also the heater only blows hot air when iam stoped or driving slowly as soon as i go on the highway theres no hot air, any help is muchly appreciated

[candyman]

oh and car runs fine other then bad fuel miledge and it has a rough idle on start up fo 30 seconds

[HatchVX]

What color is the exhuast? The heater issue i would say it is the thermostat that is bad.

[candyman]

exhaust is black when u ham on the gas when its jus idling it aint black but u can smell gas in the exhaust smoke

[HatchVX]

you will see more black smoke b/c of not having a cat. You would really need a wideband to see how rich you are running. It could be the o2

[candyman]

yea its the cheapest to fix, i was also told it could be the egr or the MAP sensor, fuel pressure regulator, or the fuel filter? how likely is it the fpr would go? the car does have 310XXX kms

[Lynxs1981]

If your thermostat is stuck open, it could cause it to run rich. It dumps more fuel until it gets warm, and the t-stat being always open would prevent it staying warm.

[hodwiththestrip]

My vote is going for the thermostat as well.

[candyman]

yea i thought it was the thermostat too, iam gonna change the thermostat and o2 sensor today and see if those help thanks for the help