I have a 92 305 TBI, everything seems good except when I I get into 2nd or 3rd gear (auto Trans) the rpm will stick for a second and drop to 1500 at an even amount of pressure on the gas. But when I give it more gas it will become unstuck and jump right back up.. it makes a sound of idle when it drops down, to me it sounds like a fuel issue?? ...( i just bought the car about 2 weeks ago)

 

sounds more like a tranny issue, well more of a sensor issue, if its getting a false input from somewhere it can in turn affect the fuel, bad input is bad output

 

Its funny u mention that, im was thinking there may be an electrical problem, I cant find my milti meter right now to check but the fan does not wrok...I put a new relay in it and also a new coolant temp. switch and notthing... but it will only work with the A/C on so the fan is not bad

 

i had the same issue, i couldnt for the life of me get my fan to cycle on its own i replaced everything so i just set my ac to max since my system doesnt work anyway, i just got a relay setup with a c/b and wired it to a switch so i could cycle it whenever i waqnted and cool down the car after i shut it off by hooking up a timer to it, worked for a while but my battery fried and the wire goin to the c/b went with it lol

 

damn, thats not good to hear for me, But Im still leaning toward a throttle body problem or possibly a Valve problem (I hope not cross my fingers) will it basically be a process of elimination to find why the RPMs drop to exactly 1500 rpm and car sounds idle like, like I said when I open it up more the needle will jump right back. what sensors u thinking about?

 

After the shift into 3rd, if you mash the gas does the engine rev higher than the increase in speed?

 

check detent cable for stiffness. check tps, sounds like a trans problem. like a sylenoid or something. 700r4?? if so you can find them cheap!

 

Not sure, I'm not big on autos, id hit up the tranny board with possible problems they can offer you better advice than I ever could

 

No, it never revs. higher than the speed, it shifts gears fine, i made a mistake when I said it makes an idle sound when It drops its more of a putter sound and the car maintains its speed.