1990 blazer s10 4.3 tbi obd code 13, 32
 

i read the codes on my 1990 Chevy s10 blazer and got a 13 for o2 sensor and a 32 for the map sensor. what order should I change things and how should I troubleshoot the 32 code or should I just change the ECM. any help will be appreciated
thanks
dave

I had the map sensor code, truck was missing, going dead, and would be hard to crank. I changed the MAP sensor and fixed the problem.