My son’s 1991 Honda Accord was running real rough. The temperature gauge did not budge from cold. I changed out the thermostat in an effort to help. When I tried to start it it started great then coughed and shuddered and then died. It keeps starting and then dying. I took off the IAC and flushed it with mass air flow cleaner. The screen over one of the ports was all crudded up. It cleaned up OK. However then I put it back it improved for a minute and then died again. I have checked for vacuum leaks but found none.
Thanks in advance for your help.