Chrysler - Ptcruiser :: CEL Cause The Car To Buck Or Stall

I have a 2004 PT Cruiser with 111,000 miles on it. A summer or two ago, whenever it got hot out, the check engine light would start to come on. Usually, it didn't affect the car's driveability - but sometimes, it would cause the car to buck and/or stall, sometimes to the point of stalling completely out. Brought it into the shop again and again. Camshaft sensor. O2 sensor. Crankshaft sensor. Replaced. Checked. P0304 misfire code came up in diagnostics again and again. Re-wiring of camshaft sensor wires. And on and on. And yet again, intermittently, the check engine light would come back on and the whole thing would start all over again. Sometimes you'd drive it, stop somewhere, start it again, and the check engine light would be gone. Sometimes it would stay on for days. Weeks. Sometimes with no other driving symptoms - it just depends on how the car is feeling? I thought the problem was limited to the hot months of summer, but now it's the dead of January in Minnesota and it's happening again. Yesterday, it stalled out completely and I had to get it towed to the shop - decided to try a new shop, they said maybe the problem was that the old shop did a bad wiring job. OK. But then, got the car back, no check engine light on first drive, stopped somewhere for 5 minutes, get back in, start it again, check engine light back on. But at least the car started and didn't buck/stall. Now it's back in the shop, but I'm ready to give up.