Singer CG590 Timing & Tension Problems

Question

I read a post you answered about someone complaining of tension troubles on their CG590 and you mentioned timing. I have similar problems on my CG590, called the repair shop, they said it was most likely timing and needed cleaning (8 months old and used most every day) so i did just that....repairman said it had lots of lint but the timing was pretty much OK and didn't need to do too much "tune up". So, I get it back home and it is still having tension troubles, but ONLY when I am free motion quilting - drop the feed dogs, put on the darning foot and sew. I would LOVE to know about the timing on a sewing machine so if you could send me that information, and anything else that might benefit me from having to take it back to yet another repairman and pay another $60, I would really really appreciate it! Thanks....Jenn [e-mail]