Replaced intake manifold gaskets- now no start

2001 S10 4.3L V6
Manual
No Performance add ons

Removed and replaced both gaskets on both upper and lower manifolds. Put everything back together and now it wont start. Engine turns and sounds as if wants to start but Nothing.:dunno: Double and triple checked the spark plug wires. Friends suggested turning distributor 180 and replacing Crankshaft Position Sensor and still nothing. :1zhelp: Any suggestions welcomed.