in fourth gear when i floor it, it gets to about 5k and suddenly drops rpms and starts acting really strange untill i let off the throttle. what could this be?

 

alot of things, youdidnt give us much to work with.
series, n/a, tii? when did it start happening, ect...

 

i got the car yesterday, its an 87, non turbo, i don't know which series, i think its a gxl, two seater.

 

I udpated the thread title to better reflect the question. In the future, try and use a more descriptive title.

 

alright, i don't know much about this site, i just joined yesterday....

 

THAT'S OK. THE FIRST POST I EVER MADE, SOME TWIT WROTE AND TOLD ME THAT USING CAPS IS RUDE AND IS CONSIDERED YELLING. BUT THE SQUID NEVER SAID A THING ABOUT THREE DOLLAR BILLS THAT WRITE IN SMALL LETTERS AND MAKE NO ATTEMPT TO SPELL THE WORDS RIGHT. (Not directed at you, please). I'M STILL PISSED ABOUT THAT ON A DAILY BASIS. GRUMMMP!

It is a bit hard to say what is wrong with your car. I'd say if it idles fairly well, then it's possible that the problem is the afm. Don't go out and buy a used one on this bit of advive. It could also be the timing is really far off. I'd check that first.

Then you might check to see if both of the secondary injectors are connected up. They are the ones on the right side of the engine, under the intake duct.

Another thing...make sure the spark plug wires are on right. The coil in the front is the Lead Coil Assy and it matters not which wire goes front or rear, BUT both must be on the lower plugs.

The rear coil assy is the Trail Coil assy. The front wire on it goes to the top, front sparkplug and the rear wire at the coil assy goes to the top rear sparkplug.

Make sure the vac hose to the boost/pressure sensor in connected at the engine and the boost/pressure sensor.

I'd say its the timing or the wires on wrong, IF the engine is any good at all. OR someone could have done the throtle body mod and screwed it up so bad its pathetic. humor.