I have a 1991 Toyota Pickup DLX 4cyl manuel tranny that either when its hot out side or once the truck warms up boggs out/loses power while accelerating. Only when its hot outside or once the engine warms up. Another odd part is that it will only do it once or twice then stop. It also will stop if I let off the gas for a few seconds or press the pedal down almost all the way. I've noticed that if I'm at idle, like at a stop light, for a while longer than just a normal stop and go like a stop sign, it will happen when I start to accelerate from that stop. Like the low rpms are fouling the plugs or something. I have new plugs/wires/rotor/cap/air filter and have run 3 different kinds of injector cleaner through it. I've even put seafoam into the breakbooster vacuum line and nothing seems to fix the problem. Because it happens so rarely and once it happens it stops I'm pretty sure it isn't so don't say fuel pump or filter. I'm thinking at this point it must be like the intake air temp sensor or something. If so second question is, would a k&n high flow filter help? Thanks.
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