Help please, poor running and cutting out.
So... My 2.0ts 156 has been running with the MAF sensor unplugged for a while whilst i sourced a new (second hand) part. During this time it got to the point where the engine would not rev at all with the MAF sensor plugged in, but ran okay without, expect on start up where it would try to stall and generally sound like it wasn't firing properly.
It then started to cut out whilst driving, if the revs got low the engine would just cut out and not start again for 20 mins or so. To add to this a while ago i had a problem where the car would fail to start from cold which had gone away for a few months (so i was pretending it had never happened)
The new MAF sensor arrived and unfortunately it had no effect on anything! Took it to a garage and they diagnosed a faulty Crank Arm Sensor, faulty MAF meter and IAT sensor (whatever that is.) But the chap reckoned sorting the Crank Sensor could solve all the problems. He wanted £250 to do the job which i am not prepared to pay as it may not fix the problem and the car has other issues (the straw that broke the camels back etc.)
However it looks like the Crank sensor is easy peasy to change, and only costs about £35 (assuming a crank sensor and crank arm sensor are the same thing?). So my question is is this likely to cure the poor running of the car with the MAF plugged in? Considering i have changed the MAF sensor but it didn't help?
Also what would you guys do in this situation? Lets say i need to spend £35 on the crank sensor that may or may not fix the poor running. The car still needs two new tyres (£150) and a cambelt (£330) in the next few weeks and has very noisy suspension, an oil leak and a few other little issues. I have lost most of my confidence in this car, as much as i have loved it. Would you persevere or draw a line under it and move on?
ETA: in good running order the car i reckon the car is worth about 1k tops (2001, 130k, 2.0 veloce)