1990 535I 150K miles - was running good no miss - slight off idle hesitation.

Tune performed includes:

Spark plugs - Bosch Platinium 2
New BMW distributor Cap and rotor
New rubber from air cleaner all the back to intake 2 large tubes replaced and small tube to Valve cover.(vaccum line reconnected)
Adjusted Valves found 3 exhaust valves to be tight adjusted to .012

Problem 1:
Broke a inductive pickup off one of the distributor wires (3rd plug wire on distributor cap not sure what spark plug or if it goes to the ignition coil) - I have since glued this back together not sure what it is for?? Did not change the problem. - plus this could be the problem.

Point of this post:

Car runs much better except for a miss under hard aceleration mostly between 3 to 4 k RPM. This is intermittant and if I acelerate slowly does not occur.

So any sugestions on:

1 - Inductive pickup wire I broke - what it does??

2 - Problem with my car

3 -Bosch Platinuim 2 spark plugs??

I have been trolling this site for a while so look forward to interacting with this group.

Thanks in advance!!!