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My car has done 140 k which is not too bad but it's fuel economy is shit and has bad starting in the morning. Engine turn up then stall eventually if I don't put my feet on acceleration it's just in morning then whole day it's alright. But I can't understand what's wrong with it I has done a engine service, new coil packs, new spark plugs, new AFM but still it's doesn't have a much power. It's 97 series 2 rb 25 GTST by the way . It's doing 300 to 350 per tank . Any idea please would be appropriate.

Have you covered all of the advice given in your other thread here? 

 

Oh, and here? 

Stop spamming and address the advice already given to you Bob. No use asking if you're not going to take the advice given to you. O2 sensor is a BASIC one suggested by multiple people. There's multiple stages to diagnosing your problems, you need to attack via a process of elimination.

If not, take it to a pro.

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Another thing to consider is a fuel leak, one of the lines leaving my tank had a split inside, which leaked if you put any pressure on it, as well as the main tank seal is known to deteriorate.

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