MSP dies when I let off the gas

[Boilermaker19]

My original problem was smoke at startup, leading to valve stem seal replacement.Put her back together, still have the smoke, and my A/F Ratio is pegged high on my wideband, but the car runs as if it is running rich (hence the smoke, I hope), and I have an oil leak on the passenger side of the engine. Today I replaced the crankshaft oil seal and fixed a couple of exhaust leaks hoping to cure both issues. No dice. I still have an oil leak, and now a new problem: Car runs fine when I'm giving it gas, but when I let off all the way it dies. Idle is very rough once the car warms up.When I start it cold it will idle. Problem codes are O2 sensor heater bank and random engine misfire. I am running FMIC, 9 pounds boost, SSAFC with FMIC winter tune on it. 3"catless exhaust.

 

[Keno1542]

Checked for vac leaks? Compression test? Need to find where the oil is leaking from...while I don't think that is the issue here, it needs to be addressed for sure.

 

[Keno1542]

Random misfire could also be a fuel or spark issue. Should probably test to make sure all the spark plugs and injectors are firing.

 

[Boilermaker19]

Turns out the misfire was that the timing was off a tooth. Runs smoothly now, but my wide band is still reading pegged high, and the car acts like it's running rich. It smells like it's not burning all of its fuel, and If I punch it it lurches and coughs. f No obvious exhaust leaks, and I cleaned the MAF. I just installed a new O2 sensor, and I'm wondering if it's bad. The biggest problem is that I still have the oil leak and I cannot figure out where it is coming from. Any tips on that?

 

[hornsfan10609]

You can try to reload the tune on the AFC, it's not common but I have heard of people having to re-flash them before. Only way to find an oil leak is with a flashlight, get under there and see where it's coming from

 

[Boilermaker19]

Fairly certain the oil leak was from the crankshaft seal. Will find out for sure hopefully tonight. Got it apart, just gotta get the new seal in without boogering it up and put it back together. The timing was off a tooth, so that problem i've fixed. After the oil seal, i'll tackle the low boost. This car can be exhausting.

 

[TrueSpeedRacing]

Have you checked your camshafts seals? Thought mine leaked threw the crankshaft seal but it came out to being the cam seals.