The only vacuum lines a LUV engine needs to run properly are to the brake booster, the distributor advance, the PCV port & the charcoal canister at the fuel return provided it's even still functional. Everything else can be removed/plugged. You might try simplifying the vacuum maze at least temporarily, see if you can eliminate vacuum as the cause of the problem, then restore it all if emissions requires. Try backing off your timing, see if it smooths out, then advance in stages until you get the best power without spark knock under load, 12 degrees may not be the best advance setting for your engine, especially with the block/head combination you have. A G200Z head on a G180Z block lowers the compression (& power) somewhat from what a G180Z head/ G180Z block combination would produce.
_________________ '78 Chevy LUV,1.9,4sp,headers,31's,SAS Dana 30,Dana 20,SOA rear w/Aussie Locker, rough body, bought new 12/4/78. '87 Trooper,2.3,5sp,headers,31's,ball joint flip & spacer,Aussie Locker rear,Superwinch hubs,brush guard w/5.5K winch,more to come.
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