94 3000gt rpm issues

[Sevy]

so I bought this for 1200$ knew it needed repairs, and I've run out of ideas, replaced iac,maf,tps, vacuum lines, head gasket, 2 valves, (bolt found inside intake on 6) it has a leak in the flex pipe, dunno if its a back pressue issue? Honestly I'm at a loss has a cold air intake, replaced timing and water pump, could my timing be off? (Was like this prior to replace) Starts right up.. just no go

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[AWD-Tony]

Sounds like a misfire. Check battery and charging. Then dig into the misfire. Pull one spark plug wire at a time and see if anything changes.

 

[motomattx]

Mouse nest in the muffler maybe.

 

[Lou98GSX]

it does sound like a misfire . did you try to scan it for any codes .

 

[Sevy]

Unfortunately its a 94 so I don't have a datalogger for it, its obd 1.5 :/ which is dumb, no check engine light thou

 

[Lou98GSX]

i would double check your valve timing and if that is correct then do a compression check of all the cylinders .