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thanks for responding, 98 tacoma 4x, 3.4. for now its a process of elimination. I will add that I removed the battery for about 1 hr. and after hooking it up the engine had no power. would not come up to speed. the other question I have is when you turn the key to the on position, should the...

Truck has po171 code no vacuum leak , new pump, filter etc. runs good when cold then stats missing and hard to start. has anyone had this issue? also replaced O2 sensor upstream, coils and wires. filter and mas flow sensor.