99 ProV 150 OX66 Loss of RPM's O2 ?

berta66

Recruit
Joined
Jul 20, 2003
Messages
1
I am having a problem with my motor backing down to 4400rpm's. It will get to 5600 when I first take off for the first time but backs down after about two minutes. I have checked the fuel pumps for leaking diaphrams and they were ok. One of them had one of the check plates loose but it didn't solve my problem when I fixed it. Could it be the O2 sensor or is it still a fuel problem. I also changed the fuel filter element.
 
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