Code P0301 cylinder one misfire

1. I changed spark plugs and air filter 2. I changed the coil pack on cylinder 1 3. I tested cylinder compression, checked out 4. I changed the fuel injector on cylinder 1. Things to note: I clear the code and the car idles smooth around 1200 rpm for 30 seconds before the rpm's dip to 700 and the check engine light flashes again. When I remove the plug to the MAP sensor, the check engine light no longer flashes.
JA: Does the light stay on, or does it blink?
Customer: Blink
JA: Are you fixing your Element yourself? What have you tried so far?
Customer: 1. I changed spark plugs and air filter 2. I changed the coil pack on cylinder 1 3. I tested cylinder compression, checked out 4. I changed the fuel injector on cylinder 1
JA: Anything else you want the mechanic to know before I connect you?
Customer: I clear the code and the car idles smooth around 1200 rpm for 30 seconds before the rpm's dip to 700 and the check engine light flashes again. When I remove the plug to the MAP sensor, the check engine light no longer flashes.