It's a Coats pattern - Quick Knit Blanket - 928-0650. The picture has a zig zag knitted rib along the length of the afghan, so maybe the pattern is correct and I should follow it regardless of how the row ends up?
Cast on 121 - garter stitch 6 rows
Row 1 and 2 - P2,K2; rep from
Row 3 - P1, K2,P2; rep from. end K2,P1.
Row 4 - K1, P2, K2; rep from. end P2,K1
Row 5 and 6 - *k2,P2; rep from *.
Plus more repeats to 16 rows and then repeat the lot.