"1999 Toyota Camry P0300 P0302 P0303"

"1999 Toyota Camry P0300 P0302 P0303 milage:94,000 car runs perfect! Check engine light flashes then goes off then starts flashing then stays on constant then starts flashing then stays on constant,and so on! Every time I clear the codes, same three codes come back! Snap-on solaris reads same codes but says number of misfires is zero. I changed plug wires and put in new plugs from toyota dealership,tried different computer, tried different coil pack, had injectors cleaned at Jiffy Lube, tried different crank sensor,compression check was 125 on all four cylinders,no vaccum leaks, EGR working fine, new timing belt, gear teeth look good, cleared the codes but same three come back every time! HELP! CAR DOES NOT SKIP! RUNS LIKE NEW!

I think you have an intermittent problem. Just a SWAG, I think you have connection issue. Check your wire harness plugs for, loose, broken and/or dirty connections. See if is rubbing against the body or any part of the engine.

That is just an educated guess. I hope someone comes, perhaps with a better idea.

Good luck

When does the light start to blink? cruising, decell, accell.

Is there any indication of oil from the valve cover leaking into the spark plug tubes? This is a common problem on these engines.

Did all this happen after the timing belt was replaced? The compression readings sound low, I would think that they should be around the 150 to 175 range.