I have a 93 S10 Blazer Vin W. Fairly new fuel pump and filter. Changed plastic feed and return lines in intake. Runs great when it runs but once it starts to warm up will not idle and will not start for a couple of hours. Rarely okay. Will start and run with starting fluid but not idle. Spark okay and fuel pressure okay. Never a problem before removing the plenum for repair. Also when I put the plenum on, it rocks from side to side before it is tightened down. Wondering if it is leaking and may need to silicone it, trying to avoid that. Please help!