Fees like who front end falling out. I see 2 boots on each side are blown out. Not sure what it's caled

Feels like front end waving the car.

I user to be an auto tech by trade. I need to find the troubleshooting diagnostic tree for a 97 LHS with the P0401 code. The engine stall at idle while applying vacuum to the EGR valve. Need help finding the diagnostic tree for this vehicle. can anyone help? Thanks, Leon

engine light on. appears at idle after about 15 miles highway

Long crank time also. Strong raw gas smell at exhaust. Check engine light gave me a purge valve code, replaced that, light went out, now back on again. Starts right up if done within a minute or so after shut off...afterwards I need to Hold the accelerator down. Will also start after 3 lengthy cranking cycles without touching gas. Runs rough first 5 seconds then runs normal. Also noticing when in park idle is inconsistent occasionally, but doesn't stall. I did a vacuum line search, found one off, still didn't resolve issue.

AC works fine. Nice and cool.

Car ran fine, after being parked for two hours everything is dead. Battery shows charged on charger, all connections good. Won't jump start and no dash lights or audio alarms. Everything is just totally dead.

What could be the cause of a miss after a tune up?

I have changed plugs, wires, timing belts, replaced water pump.