What I am saying is that to conserve gas, the engine management shuts down the injectors when you take your foot off the throttle, then turns them back on when you slow down to near idle. It does this by modulating the EHA to reduce secondary fuel pressure to below the cutoff pressure of the injector check valves. It uses several indicators to determine when to do this, one of which is the throttle position switch, on the throttle valve shaft pivot. When that switch makes poor contact, the EHA will switch pressure up and down, causing the engine to surge.

Steve

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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7