Last night, I started my 1990, fuel-injected 626, 2.2, non-turbo. It cranked for a second then there was a loud KLUNK! in the engine compartment ... sounded like metal-on-metal. It had trouble starting and would die under 2500 RPM. I saw that the intake resonator box, located under the intake hose to the throttle body, had separated into 2 pieces (I guess 207,000 miles could do that). I snapped it back together (it won't stay that way for long) and there was big improvement in starting and it runs fine if you keep the RPM @ 1000, but it still won't idle w/o dying.
Do you (anyone) think a leaking, broken resonator could cause the problem? Maybe the loud sound I heard was it blowing apart. Any other suggestions are appreciated.