got new plenum. Now I have knocking, low oil pres, light smoke when warm. Cause?

What is your question?

I had a new plenum kit installed. Bad seals and small leakage when warm caused random misfires. got that fixed. Along with oil change and radiator drained and refilled. Now i have a knocking sound that wasn't there before and some kind of small oil leak, I believe on front part of engine (from the light smoke). In the morning the oil pressure is fine. Could a bad install of the plenum cause an oil leak? Any other help would be great!