Dryer would not work. I changed a bad fuse in rear, also changed the Ignitor and two new coils. It started o.k. for a short test. I moved unit back into place. It then worked for a short time. It then stopped, and as I looked into the burner area, the ignitor lights up, and the gas comes on about 2 to 3 seconds, and then goes out. It does then 3 or 4 times, and then only ignitor lights up, but no gas comes on. I checked the flame sensor with a meter while I had the unit apart, and it checked out o.k. What can I check out with a meter, or might be the fix.?