help

hi im new to the forum not sure ive posted this in the right section basically got a grand renault scenic 1.5 dci 54 reg with starting problems have changed the following to no avail. Tdc sensor,cam posistion sensor new glow plugs and new glow relay still no luck the car tends to start second time round and sometimes driving looses power for a second our two. codes showing po0340 and po0670 i no these generic any help would be appreciated.

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help