90 300E 3.0L Won't start

[Bobcin5859]

Anyone,

My car won't start unless I depress the air sensor plate a slight amount. Then when I let go of the plate, it stalls.

I initially misdiagnosed the problem as fuel pump and replaced the pumps and accumulator in the back.

My Calfornia model with the counter is blinking codes: 7,10 and 27.

The car started to hard start over a 30 day period, then the idle got bad and lastly it just won't start.

Recent, 5 months, R&R includes, plugs, rotor, caps, wires, air filter, all new vacuum lines, OVP relay, O2 sensor, hoses for the Idle Speed Valve on both sides, water pump, radiator, fan clutch, bearing bracket, idler pully, belt, power steering pump reseal, vacuum pod job, instrument cluster renovation, paint job, wheels and tires, interior reconditioning by the people who prep cars for used car delaers - So clearly Im in for the long haul.

Im about ready to have it towed to my local independent Benz Doctor.

If anyone has any insights, let me know. Thanks