ok I'm trying to trace down a stumble in my car I check the codes it had a code 36 so i replaced the relay to maf. So no more check engine light. After i changed that it idled better and drove better, but at wot it stumbles really bad. so i wanted to know what you guys thought it could be. p.s. 87 gta 350 tpi. Also I tried to check the ohms on the injectors but i'm not sure what the ohm meter needs to be set on,but i put it on 20k. Thanks in advance Kevin

 

Put your ohmmeter on it's lowest setting above 20 ohms. Not 20K ohms.
You may also have problem with a plugged fuel filter.

 

Also check your coolant temp sensor