help please! No throttle response
 

After installing a new head gasket and finally getting my 1990 n/a supra to crank I discovered I had a miss. I actually had good throttle response with the miss, but today I installed a new distributor cap, rotary button, plugs, and plug wires. I got it idling perfect with no miss, but when I gave it gas the rpms slowly climbed and topped out at 3500 rpms. Also when I turned the car off I could hear the radiator bubbling and dream was blowing from the overflow tank, so apparently the car got a little hot. Can over heating cause sluggish throttle response? Thanks for any info, I am open to any suggestions!

update on the problem
 

So I let the engine cool off and filled the radiator with water. Then I cranked it up with the radiator cap off and tried to rev the engine. Still no throttle response and water was gushing from the fill up neck on the radiator... I have never seen anything like this before! Someone please help! Thanks

thermostat

Would the thermostat cause my lack of throttle response?

Maybe and did you try calibrating the tps

I haven't tried that, but I had good throttle response last night before I put the new plugs, wires, distributor cap, and rotor button on... wouldn't that indicate the GPS was functioning properly?

That was supposed to say tps instead of GPS... LOL. Stupid smart phone! Anyway, I discovered another piece to the puzzle... After taking out my thermostat, I ran the car and it is still very sluggish. This time though, I found that my exhaust manifold was literally glowing red! Stopped up cat? If so, why would that affect my coolant flow? Is there something more serious going on here? Any input would be greatly helpful...

Glowing red hot exhaust manifold/ coolant gushing from radiator fill-up neck!!!
 

What the #@&$ am I dealing with here? I just replaced the head gasket on my 1990 n/a supra. Also new plugs, wires, distributor cap, and rotor. I have very very sluggish throttle response and I am lucky to get the car to rev to 3500 rpms, but it idles great... Any ideas? Any input would be greatly appreciated. Thanks

Sounds like maybe your ignition timing is off. I can't remember if a red hot manifold is a sign of advanced or retarded timing. But that can also explain your sluggishness.

Check timing I rebuild my motor and the distributor was off a few teeth. it run but like crap and I have a aftermarket header and two pipes was glowing red.