GTB08

Mechanic said no compression codes were recorded none at all so not done. He also said the issue would be constant at all revs if it were compression or valves When driving sedately there is no apparent issue Yeah all mods tuned to suit on 98ron

Im a newbe from Australia on this forum thanks for having me I have a my09 spec b with basic bolts incl vf 52 stock IC Car was running dreamy until recently Recently under wot the car misses and backfires. Normal throttle and it is ok Same in i s or s#. Blows black smoke like fuel gets in but cant burn it up The more you give it the worse the car runs. Cant overtake as the power is lost etc. Mechanic discovered issues with cyl one and two?? (well the front on either side were having trouble when he logged it. Spark plugs were changed earlier but no difference Air flow meter changed no diff Coil packs replaced and still no change. Wot it will splutter and misfire and backfire Mechanic is a good guy but isnt sure what it causing the issue. Maybe a sensor? Anyone else had an experience like this or suggest where to next? Tia Tony