Been trying to diagnose this 2002 blazer 4.3 that died on us and wouldn't start back up. Checked spark its good fuel pump licks on fuel pressure is good. Shot starting fluid in intake an won't start. Thought it was distributor button replaced it still nothing now someone is saying its the distributor but don't want to keep buying 200 to 300 parts that isn't what's wrong. Is there anything anybody can suggest that I could check and possibly get it running again