How to Troubleshoot Engine Stalls in a 1999 Lexus RX 300?

It sounds like you're dealing with a frustrating issue with your 1999 Lexus RX 300. Based on the P1349 error code you mentioned, it seems like the VVT system is having a problem, likely due to a clogged oil control valve filter. This filter is crucial because if it gets blocked, it can definitely cause your engine to die or have trouble starting intermittently. The oil control valve filter is located just below the throttle cable, so you’ll want to check there. Replacing it should cost around $45, and it's a good first step since a clogged filter can prevent proper oil flow, leading to the symptoms you're experiencing. Once you replace the filter, it would be wise to run another scan to see if there are any other failing sensors that might be contributing to the issue. Regarding the engine cranking but not starting, that could indicate a failing fuel pump, especially since you mentioned that the fuel pressure was checked at 45-49 lbs and fuel shot out when you cranked the engine. However, since you have the error code pointing to the oil control valve filter, addressing that first is a logical move. Keep in mind that excessive vibration, like slamming the hood, might not directly cause the issue, but it can exacerbate problems if there’s already dirt blocking the filter. After you replace the filter, monitor how the engine behaves. If it continues to have issues, we can explore other potential causes together.