I replaced the CPS on our 300E (which still tested within spec) and all of our issues went away. MPG's went from 11 to 22 and no more idle issues or misfiring/plug fouling. Its been 550 miles with 0 issues, not so much as a single misfire....with RESISTOR (dun dun dun) Champion plugs in it.

It starts up MUCH faster too, crank....Vroom! Right away. Its awesome!

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'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
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In that case maybe I should too. I get similar MPG (13 average)...or at least last time I filled up. We will see any difference is made since the valve job among other stuff that was done in the past week.

Where is the CPS located? When I had the head off I was meaning to find where it was, but never got around to it. Is it difficult to reach with everything back together now?

EDIT: That reminds me...we talking Cam Position sensor here, right? The Crank position is at the front and only references for the odometer as far as I understand.

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
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2003 Gray Mercedes ML350 - 122k

The 103 doesn't have a cam position sensor, just a crank position sensor. As counter intuitive as it may seem, the sensor on the front of the engine isn't it. That is just a diagnostic reference sensor. The actual crankshaft position sensor is located in the rear of the engine near to the bell housing under the oil filter area. It's harness is tangled under the intake manifold and eventually snakes its way to the ignition module. Not a lot of fun but do-able to replace, though its failure is rare. I think I've replaced one in the last five years.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff