I replaced the EGR on my 89' 305 TPI, and after I put it back together there is a high idle and loud sucking vacum comming from the Plenum or at the Runners. I was told to take it apart and see if maybe there was a bent gasket or somthing (GM Gaskets). All looked good so I put it back together again, and the same thing, no change. The one thing im not sure of is that the gaskets came with Blue RTV sealant, should I use this on the Plenum & Runners to help make a better seal?

 

two things could be wrong since the intake is only aluminum it warps easily the gasket surface could be uneven assemble it and use a can of carb cleaner with the little red extension straw and concentrate it where you think you hear the leak if the idle surges that's it than you can find a way to tighten it or silly cone it

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87 trans am,gm crate 350(4 bolt mains 10to1),L98 aluminum heads,LT4 hot cam,slp runners,slp 1 5/8 headers,3in.y-pipe,edelbrock base,hi flo cat,air foil,afpr,as&m ported plenum,gutted airbox,t-5 tranny w/centerforce clutch and a 3.27 9bolt(11.9in. brakes),ed wright's fastchip,relocated iat sensor,160 fan switch&t-stat,tb bypass,accel supercoil,cap& rotor,hollowed maf,slp 3in. catbcak.

FOR SALE!FOR SALE!FOR SALE!FOR SALE!FOR SALE!

EVRYTHING IS FOR SALE WITH MY CAR (EXTRA ENGINE,TPI INTAKES,RUNNNERS,PLENUMS,ECM W/CHIP,new springs,aluminum driveshaft.

GETTING OUT OF THE 3RD GEN MARKET BEST OFFERS
CONSIDERED!!!!!!!!!!!
anyonne from new jersey interested??????

 

Those gaskets do not need sealant. Did you check to see if you hooked up all your proper vacuum accessories?

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1989 IROC-Z 5.7L
NOS 5151 150HP kit
ProBuilt 700R4, PI Vigilante 2800 stall lockup
Baer Brakes 12" Sport System