Chevrolet Repair: caprice will not idle, chevy caprice classic, small block chevy

Question
i have a 1992 chevy caprice classic with a 5.0 replaced intake manifold gasket started vehicle ran ok but will not idle checked i have no vacuum leaks,intake gaskets seem ok any hints or advice was wondering if distributor timing was off if that can cause a no idle condition due to marked distributor but don't have a timing light to double check thank you

Answer
HI DAN, IF THE TIMING WERE OFF THAT FAR TO NOT LET THE ENG IDLE IT WOULD NOT RUN GOOD OFF IDLE EITHER. USUALLY WITH A FUEL INJ ENGINE IF THERE IS A VACUUM LEAK THIS WILL INCREASE THE IDLE SPEED. SO MY NEXT MOVE WOULD BE TO CK AROUND FOR ANY CONNECTIONS YOU MIGHT HAVE OVERLOOKED,[ELECTRIC SENSORS] THE OTHER POSSIBILITY IS DID YOU HOOK THE EGR VALVE TO A VACUUM SOURCE THAT IS LIVE AT IDLE..THIS NEEDS TO BE ON A TIMED PORT,MEANING NO VACUUM AT IDLE, ONLY OFF IDLE TO OPEN THE EGR VALVE. IF THE EGR IS OPEN AT IDLE ENG WILL STALL. USUALLY AFTER SOMEONE REPLACES A INTAKE THEY FORGET TO HOOK SOMETHING BACK UP..I AM NOT SAYING YOU DID,BUT YOU NEVER KNOW.. AS FAR AS THE ENG TIMING GOES YOU COULD DO A BACK YARD SETTING, ADVANCE THE DIST TILL THE ENG STARTS TO PING UNDER LOAD [DRIVING IT] AND BACK IT OFF. TO ADVANCE THE SMALL BLOCK CHEVY DIST,, WILL NEED TO TURN COUNTER CLOCKWISE..TRY 1/4 INCH AT TIME. LET ME KNOW HOW YOU MAKE OUT,,,TOM...