Welcome, It's odd that you can run it up in 1st and 2nd without issues but not 3rd or 4th. Can you do back to back runs in 1st and 2nd without issues? This will help rule out a few things. Forum rules state that you must post a picture of your car for further assistance 
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3.4,K27,Andial IC,Sc cams,Ported heads,Electromotive Ign,Twin plug,Leask Wur,RarlyL8 zork,GHL headers,Simplified CIS,Ported fuel head,Fikse wheels,Etc.Go hard or go home
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