Lacking a new CEL since you cleared them, it sounds like you have a fuel/air leak and are losing your prime.
The CDI's rely on o-ring seals on fuel lines and filter. Check for fuel leaks.
Try parking nose downhill and see if starts easier and/or helps to find the leak.
Posting the codes helps narrow the problem down.
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Terry Allison
N. Calif. & Boca Chica, Panama
09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)
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