thats a bit vague but ill have a go. the MAP sensor is basically a Mass Air Pressure sensor inside your fuel injection system which measure the air going into the engine, and works out with the ECU how much fuel to inject to the cylinders.

if this had gone, it would run like a bag of shit all the time as you would either be flooded or not have enough fuel.

if your saying its something where it wont start from cold then starts fine, i would say its either your distcap, or your coil. a dist cap would be my first port of call as a replacement off the shelf is about £9. next i would make sure all your HT leads are sevriceable and tidy.

finally if all that is ok check the coil, perhaps see if you can get one from another sportrak but make sure it wasnt the electrics that made the seller break it obviously.

the best thing about these items is you could replace them as a service - you also know then by elimination whats wrong and what works.

i woudl also check to see if your air filter is clean.

check your air flow meter too. this is what measures how hot or cold the air temp is and sends the data to the ECU, and in turn this injects the right amount of fuel for the mix. if this is trout your engine will be like a bag of spanners. a quick fix for your air sensor is to get a "+BHP+ cheap chip from ebay, theyre about a £1. its basically a resistor you put inside your air flow meter plug which delivers a constant reading to the ECU and increases fuel input, and therefore BHP. if your engine still has running problems with this installed, its not your air flow sensor and you just tested it without having to buy a replacement. if it runs ok, you found your fault.

if all THAT doesnt cure it, try the MAP sensor from another vehicle or see if Milner Offroad sells them (in the links section, theyre very cheap and i recommend them.)

sorry for all that waffling.
pw