I have searched this forum looking for an answer but, couldn't find a similar topic. I have an '87 Supra N/A with 148,xxx miles on it and it has a stumbling problem which feels like a fuel cut which happens at varied throttle positions as well as when backing off of the throttle and it happens intermittently to make it more frustrating.
I have installed the following since I purchased it from the original owner about nine months ago:
New Toyota valve cover gaskets, NGK spark plugs, NGK spark plug wires (the original sumitomo's from '87 were still on it at 146k), Toyota dist. cap/rotor, Toyota air filter and fuel filter (the original was still present).
This past weekend I installed the Hose Techniques vacuum lines (being careful to use the thick walled in the intake manifold area). After having done all of this it still has the stumbling problem as it has since before any of these regular maintenance items were replaced. I also noticed that the T-pipe on the valve cover gaskets has a couple of bad hoses connecting it to the valve covers and that was the next thing I wanted to replace.
Any ideas would be greatly appreciated and here is a pic of the patient: