  The strong CP problem was solved by Peccei & Quinn by introducing axions,
which are a viable candidate for DM. Here the PQ approach is modified so to
yield also Dark Energy (DE), which arises in fair proportions, without tuning
any extra parameter. DM and DE arise from a single scalar field and, in the
present ecpoch, are weakly coupled. Fluctuations have a fair evolution. The
model is also fitted to WMAP release, using a MCMC technique, and performs as
well as LCDM, coupled or uncoupled Dynamical DE. Best-fit cosmological
parameters for different models are mostly within 2-$\sigma$ level. The main
peculiarity of the model is to favor high values of the Hubble parameter.
