I have a 2003 GT, so i have been having this no start problem for a while its wierd cause it kinda just does it when it wants other times it fires right up and runs perefect! All this started after swapping throttle bodies and plenums but i dont think its related? When this happens i turn the key all the way and there is no fire the starter doesnt engage or turn over. so i check it by jumpering it from the solenoid control wire to the power and it started, so from there i checked my ignition relays for continuity and to make sure they clicked by putting power to them with a battery and they are good to, after that i checked my clutch pedal position sensor for continuity which is really hard to get at when depressed it is supposed to make continuity so i just shorted out the two leads on the other end of the connector to simulate the sensor making continuity to see if it would start and if it did then it would have been that sensor but it didnt start so after that i took out the ignition switch and checked all positions on that for continuity and they were all good. Now i have no idea what to do or check im going to go through it all again and check it again but im not sure what else to do if someone else on here has had experience with problems like this it would be great to hear from you or if you have good ideas or suggestions for me PLEASE let me know PM me or whatever, and fill me in cause this is a real nuisance problem thanks!