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question without EGR

I have an EGR block off plate on the upper intake manifold. On the old EGR unit there was a vacuum line hooked up to it that run to something round which turned into a wire from. Now I hooked that vacuum line up to the vacuum tree. Could that possibly be the thing making me car die when i take it out of gear sometimes?
1987 turbo coupe 5speed: Boport stage 3 head/2.5 cam , Precision stage 3 50trim .63 turbo, Tial 38mm wastegate, Jangus gutted/ported intake manifolds, 60mm tb, Jangus open dumptube, Jangus 3" elbow, Perrin boost controller,Esslinger adjustable cam pulley, Esslinger small crank pulley, stinger FMI, RFL BOV, Spec stage 3 clutch, B&M short throw, 140 speedo, Walbo 255lph, BBK fpr, 3G alternator, ARP studs.  Be faster... :poke:
 

question without EGR

Reply #1 –
That is either a vacuum restrictor or vacuum one way check valve. It should not be there. I wouldn't think it would matter one way or the other with the block off plate. Did it stall before the block off plate? I would pay close attention to the thread near yours "missing and stalling". He appears to be fighting a similar issue. Haystack is working with him on the issue and he knows a lot about emissions bypassing and the PCM's reactions to it. Honestly I feel your problem is somewhere else.