p0171 system lean and overboosting?

[Sergiospeed3]

I Have a gen2 speed3. Have had it for about a year and it is only my second car. I am very new to the mechanical aspects of cars, but am very much interested and want to learn the ins and out of my car. My car is all stock with the exception of a cobb intake with a cobb turbo inlet hose and a synapse engineering bypass valve.
So I got the code p0171 system lean and I noticed around the same time my car started overboosting. I checked for leaks around the intake and couldn't find anything, but the bypass valve hose was pretty worn out so I replaced it. And for good measure I decided to clean the maf sensor. Well that didn't help. I did take it to a mechanic and he did a smoke test and claimed to have found leaks in the exhaust, turbo, and catalytic converter. And said he would have to replace all those gaskets. I attached pictures of the diagnosis and parts. Sounds like bogus to me though, that coincidentally all those started giving me a problem at the same time. Also the turbo overboosting to me says that the problem might be around the turbo area. If I drive a few miles without boosting my cel goes off and only goes on as soon as I boost. My boosts climbs to max psi almost immediately as I enter boost. I've done some research and have found that this can be a waste gate problem. But if that was the case shouldn't there be more codes than just a p0171. I plan on removing the TMIC tomorrow and checking around the waste gate area. Just wondering if any of you have had similar problems. I have searched the forums and can't find anyone with an overboosting and p0171 problem. Also don't have money for accessport at the moment by I do plan on buying one later on this year.

[Flying]

Did you try checking for boost leaks? Also try tightening up wherever your boost flows ...