Your post states it was the IP (a small o-ring) that was leaking. If that was at the top of the IP (flat milled section with 6 valves) that would be your delivery valve seals that were repalced.
That being the case, hopefully your problem is a simple matter of the valve holder being torqued wrong and not the valve itself having been filddled with. If the valve was messed with its going to have to be flow tested and recalibrated on a bench.
Pending whom you ask the torque is either 30nm, 30nm, 35nm; or 35nm one time only.
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*edit* You aslo stated it was running bad (smoking) and that was why he attempted to adjust the IP timing.
I think you need to back up and tell us what was replaced to begin with.....
was it one of the 6 valves on top?
http://detali.ru/cat/oem_mb2.asp?TP=1&F=210025&M=606%2E962&GA=722%2E608&CT=M&cat=19T&SID=07&SGR=045&SGN=01