iam trying to fix my 95 4.3 blazer 4x4 but is just problems after problems , I have 2 troubleshooting codes p0172 and p0138 I kinda have an idea of what the p0172 it is but p0138 have no Idea I want to to how many o2 sensors do a 95 blazer maybe that's whats causing the p038 to pop up

 

Well I'm not sure if you have the CPI or CSFI motor I have a 01 blazer 4.3 CSFI and the spider went bad causing the 172 code ppl have argued with me about but it fixed it but vacuum probably could possibly set that to....as far as the 138 code I know mine has 3 o2 sensors....2 ore cat one post cat....from what I can gather its satin high voltage on a circuit (above .900 millivolts for two mins I think) so that being a 95 I'm not sure....if its. Obd2 a scan tool with live data could help

 

i went to autozone guy told me it that p0172 code can be also the fuel pressure regulator ...my exhaust smells like pure gasoline and evrytime I step the gas it kinda spits chokes etc

 

the smoke that comes out my exhaust I meant