As I've mentioned before... I don't get out much in my car. Recently it's started doing something odd (and slightly terrifying) whenever I accelerate to get onto the M-way.

The car is fine up to 50mph, and the pedal doesn't stick when accelerating up to or at those speeds. But when I'm putting on a little extra to get up to 60 or 70 (it's a weedy 1.4), it gets stuck to the floor. What then ensues is my mild heart-attack/panic while the engine goes, "Sqeeeeeeee," and then I tap the brakes... which seems to make it pop up again.

The pedal action isn't that smooth or sensitive normally, but it's never jammed itself down before. Some of the online problem solvers suggest that the throttle body needs cleaning, some say there's a cable that needs replacing. I'm a bit broke at the moment (hence not driving much) - is there anything I can try to fix it myself?