starting problem

[sweet93]

i have a 1993 gmc sierra. the truck just starting having problems starting. the truck will start sometimes but now it seems like it dosent want to start at all. it will turn over but no fire, and if it does it will die right away. i just got it back from a shop that wanted to charge me $1000 for replacing the iac control valve, and the ignition control module. they did a test on the fuel pressure and that is good. the question i had is how hard is it to replace those parts? they said i will need some special tools but i call bs. should i rebuild the tb? i just bought the truck so i dont know if it has ever been done. is there anything else i should replace while im at it? the motor has 30,000 sence rebuild