First of all, your first description of the noise and the stall, are classic with timing belt failure. I can't imagine you having problems after that. It seems coincidental that after replacement, you have crank position faults, low/rough idle, and now you need valves. My question is, was the timing belt job done properly? I don't believe you have an interference engine, meaning one that the valve and piston occupy the same space, and when timing is lost collision occurs. This is what damages valves. It would be interesting to find out what test was done to condemn the valves. If the cam timing was off, and they were rolling the engine to tdc of each cylinder, then valves(off time) could indicate leakage. Before I authorized any further repairs, I would ask some questions, one being 'Is my engine an interference engine?', And another would be 'Has the timing belt setting been verified as correct?'. The reason for this is, you had a vehicle that was running fine prior to the belt failing. Typically, it is your higher performance, multi valve engines, that are interference engines. I will try and find out and reply to this thread, more than likely within the next half hour or so.
Thursday, September 8th, 2011 AT 3:39 AM