I just changed my ignition control module it starts up but with sluggish rpm.

What is your question?

My service engine light came on after I put a used one in before I put the new one in today. How can I fix this problem I went through 40 dollars in gas just going 120 miles this is my only transportation to get get back and forth to school I am lost now. What would cause my oil pressure to drop also. It lost all power going up step inclines and it was cutting out on me.