I am having trouble getting my engine to idle

My 85 camaro iroc z28 with 305 tpi wont idle. Good fuel pump and filters new. Tps new. Turns over wont start, then I give it gas and it starts let my foot off the pedal and it dies. No oder of gas. Can someone help here cant afford the shop. I just went through the smog prosess and replaced the tps and the cat. Converter and passed. 2 days later early am. Tried to start it and just cranked over. So tested the fuel pump and replaced it cause it read little low. That was hard had to cut ex. Pipe cause smog shop weiled it one pieace. Still didnt stay running onit own. What could it be may egr would it do this cause somg shop left that hose off I noticed. Put it back on no help. Please help