Check cap and rotor, then look for a hose off the idle control valve (remove air filter housing). Likely the rotor slipped, it backfired, and blew the idle control valve hose out of the rubber boot between air flow meter housing and throttle valve.
There is a part on the end of the crankshaft known as the rotor carrier. These break and cause the rotor to slip and the spark to be delivered to the wrong plug, or in your case, possible far enough off that the spark cannot jump to the correct pin except at full advance.
Peter
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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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