Hi, I accidentally left my car running for more than 10 hours and was wondering if that could cause any major problems?? Any feedback would be greatly appreciated. Thanks, VC

i have a 1990 honda civic lx and i belive it has a 1.5. i recently changed out my fuel filter and i think i may have knocked something loose in the process (due the fact that the bolts were extremly hard to get off). well anyway i drove it right afterwards on the interstate at about 70-75 miles per hour for about 15 mile when i bagan to slow down it wasn't doing it properly. when i came to a stop i was idleing at about 1.5 rpm and when i put it in park it was at 3.5. i think the throtle may be stuck or i put a kink in the line. now i would like your opinion on what you think is wrong and what i can possibly do about this. and the pedal has alot of play in it.