On a 1997 Dodge Stratus, when I try to get access to the upstream oxygen sensor from above or below, there is very little room to move a ratchet or breaker bar. Are there parts that must be removed to get enough access to remove it.(Such as axle, etc??)?? Also, is there a way to make the sensor looser. It is really hard to try to turn.

If it has a choke, where will I find it?

Van starts fine when engine is cold. When it warms up, the starter cranks really well, but engine will not take off.