Weird rpm while driving and accelerating
 

My tbi when driving normally going 40mph, rPm is at 15 then drops to the line between 10-15 then goes up to 15, over and over, then I accelerate and it stops until I get to 60mph then it happens again. It feels like a slight hesitation. Someone told me it was the iac, or tps. Any ideas?

Re: Weird rpm while driving and accelerating
 

could also be vacuum leak. check your hard (plastic) vacuum lines make sure none of them are broken. Had this problem with an old 88 firebird a few years back.

Re: Weird rpm while driving and accelerating
 

You got the A/C on??.

Re: Weird rpm while driving and accelerating
 

I'll check for vacuum leaks. And no I don't have the a/c on.

Re: Weird rpm while driving and accelerating
 

Got to go.Might catch up later today when I get back.

Re: Weird rpm while driving and accelerating
 

if i remember correctly there is a hard plastic line going to the trans check this one for sure that was the one that was broken on mine