1995 ti only stalls during the daytime...?

[Jazzcash]

I have a 1995 318ti and it seems to only stall when it is hot outside, during the daytime. I would start it up in the morning and it would run fine cold, then get up to optimal temp and still be fine. But when it starts hitting noon, the car's performance starts to decline and eventually it will start to stall. I will be driving on the highway when suddenly the car will jerk, as if it is trying to stall, but by having my foot on the gas pedal it wont. Just a quick split second jerk and thats it for about ten or twenty seconds then it will happen again. if i am at a complete stop it will just die with little to no shudder. But when it starts cooling down outside it will stop and performance returns and runs just like new. I have been looking everywhere and i cannot find a solution to this problem. Any help would be greatly appreciated. Thanks!

[318iM44]

Would these 2 codes causing random stall and misfire??

The CEL has been on for awhile, and when the engine randomly stall and misfire, either at a red light or on the freeway, the CEL would rapidly flash like a police strobe light.

According to CarSoft 6.5 it says DME MS41.0
The car is stock '98 318i 5speed hwith ASC.

These are two codes:
- 62 Secondary Air Injection System : Switching Valve
- 254 Tank Ventilation System : Large Volume Air Leak

The SAP and the Switch Valve attached to exhaust manifold are new and working great.

I've check the Fuel Expansion Tank (rear passenger fender), and Canister / Purge, located in the trunk under the spare tire.

They all are in good shape, no leak, no crack or broken nipples or hoses.

I also did the infamous "use brake cleaner to find vacuum leak hoses"
with zero leak result, and all the vacuum hoses are tight and newly replaced.

Not to mention all kind of under the hood parts total of ~ $1,000 (parts only) that you can think of have been replaced. You name it.

The car runs great except when it randomly stall and misfire.

Would those code 62 and 254 really the cause of random stall and misfire??