The oil pump is not causeing the rough idle. The low idle speed is
causing the eratic and low oil pressure.
Was it rough before your 'tune-up'? Maybe you knocked a vacuum line
off or something else or you could have had a vacuum leak before the
tune-up if it ran rough then.
You could check or have your diagnostic codes checked (Free at Auto
Zone I hear.) and see if it points to something. Don't spend money on
parts until you have a clear diagnosis.
My old 88 4x4 S-10 Blazer with a 4.3 V6 has a horrible idle. I still
see it, as the current owner is a buddy. Most of it is caused by a cracked
plastic vaccume line he refuses to replace, a clogged up TBI unit, and dirty
The TBI's can get pretty gunked up in the PCV port, and the other
vaccume ports. Plastic vaccume lines are bad for cracking and breaking
apart, and dirty injectors are often more evident at idle.
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