engine light

i have a 94 exploder with 135,000 miles. ever since i've had it its started hard. it takes bout 5 seconds (sometimes more) of crankin to get it started. but once its running it runs awesome. about a month ago the engine light came on and i took it in to see what the prob was. it popped up codes for the tps sensor and cylinder identification sensor. i replaced the tps sensor but the cylinder identification sensor i was told could be the camshaft or crankshaft sensor. does this sound right? the cam sensor is $200.00 and the crank $60. if any one has any ideas before i blow $260 bucks it would be greatly appreciated. they want a couple hundred buck to just test each sensor. so id like to figure this out on my own so any help would be awesome....thanks