More of a detailed description might help narrow things down. Ie will it restart, immediatley or not? Any popping/backfiring...intake or exhaust?
When you say it bogs this leads me to believe you may have a fuel system issue. With ignition failures you may see backfiring or have it cut off cleanly. Stumbling is more an indication of a poor fuel mixture or a problem that simulates one.
You replaced the fuel pump and regulator, but did you check fuel pressure first? Have you checked for vacuum leaks? If it stumbles/bogs as you stop is your brake booster bad? Could the EGR have stuck open? Checked to make sure the IAC is not sticking/gummed up?
Any codes? A torque convertor not unlocking can kill yor engine ...if you were going that fast


Good luck.