Have an 87 420 SEL in the shop with a no start condition. It stalled dead on the road, no stumble or warning. will not start on starting fluid. it has fuel pressure at the fuel distributor (cant check the psi, dont have the right fitting, but its alot) and plenty of spark. have checked spark with an inline tester and a clip on. checked timing, around 8 degrees. both fuel pumps are running and putting out plenty of pressure. fuel is coming out of the ports on top of the distributor when disconnected and i crank it with the sensor plate pressed down a little, but none comes out when cranking if i dont press on the gas or push down the sensor plate. have replaced the coolant temp sensor and the fuel pump relay already. once in a while, it will try to start, but never quite make it. most of the time, it will catch momentarily on the first turn after sitting for a while, but then not even catch or try to after that. have pulled the plugs and they are not wet, so it isnt flooding. took the fuel distributor apart and it is fine. no binding. any ideas? have checked just about everything we can think of.