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I've been having trouble with my fuel trim going in and out of open loop closed loop. I drive up to operating temperature at about 178 to 183 watching fuel trims since it set a p0171 code for lean bank. I've checked for vacuum leaks-none, I cleaned out the throttle and iac due to rodents making a nest out of my air filter, cleaned maf which reads .05lbs at idle. After test drive I notice it will go to closed loop then short term goes to max rich then it will go back into open loop fault. It's happened every time, I've clamped off purge valve thinking it was stuck open- no change. Please help
 
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