1994 2.4, car has been perfect but the last few days it doesn't seem to like hills, when the autobox changes down to climb when it's to much for top gear the green turbo light goes out and the check engine light comes on, if you lift the throttle it reverts back to normal, fluid levels are fine and it's had an oil change about 500mls ago, anyone here had similar ? I'm suspecting the turbo but it's not smoking at all ??