The only adjustment that works for you is the base MAF. You need a Bailey chip to enable the WOT MAF adjust ability.as far as the translator goes I set it correctly for the sensor. but I set it 10% richer on the sensor setting and 5% richer on the fuel trim setting. and it seemed to idle better like that. should I switch it back to the regular settings?
Your EGR isn't the problem.You eliminated that when you capped off the line going to it and still saw 150
Check your ECM solenoid fuse as the cause of your code 31.