I have a 91 trans am.....can a bad coil make it bog down when u accelarate?

91 model is split,is it port fuel injected?and has it a distributor,and is the distributor near the water pump on this model? 91 model is split,is it port fuel injected?and has it a distributor,and is the distributor near the water pump on this model?

Any codes in the computer?If so,what where the codes? Any codes in the computer?If so,what where the codes?

Did you change the throttle position sensor,or the idle air control? Did you change the throttle position sensor,or the idle air control?

It is normal to loose vacuum on acceleration,now,is there any codes?And does the engine run rough? It is normal to loose vacuum on acceleration,now,is there any codes?And does the engine run rough?

There is a knock sensor,on the right side of the block,down low,but above the oil pan,looks like a bell,with one wire going to it,it is a green wire,check the connection to it,and tell me when you have checked it. There is a knock sensor,on the right side of the block,down low,but above the oil pan,looks like a bell,with one wire going to it,it is a green wire,check the connection to it,and tell me when you have checked it.

Check the return line to the tank,and the fuel pressure regulator,if it does not allow the fuel to return to the fuel tank,the engine will bog down bad,plus check the timing,and the est module if equipped,some are built into the ignition module,also,how did you check the knock sensor?If the knock sensor is bad,it will bog like a big dog! Check the return line to the tank,and the fuel pressure regulator,if it does not allow the fuel to return to the fuel tank,the engine will bog down bad,plus check the timing,and the est module if equipped,some are built into the ignition module,also,how did you check the knock sensor?If the knock sensor is bad,it will bog like a big dog!

OK,let me know. OK,let me know.

That is not the knock sensor,it does not fit in a whole with a water jacket. That is not the knock sensor,it does not fit in a whole with a water jacket.

this is what it looks like this is what it looks like

I sent you a picture of it,and the knock sensor does not screw into a hole with a water jacket,the hole it screws into has a bottom in it,where is the part located you removed? I sent you a picture of it,and the knock sensor does not screw into a hole with a water jacket,the hole it screws into has a bottom in it,where is the part located you removed?

Some one has bored out the hole,into a water jacket,or it is in the wrong place,the est module is a dealer part,if it is separate on the engine,it is mounted all by itself,it is flat,and has a 3 inch flat plug connected to it,the est module is most likely built into the module on this module,how many pins does the ignition module have? Some one has bored out the hole,into a water jacket,or it is in the wrong place,the est module is a dealer part,if it is separate on the engine,it is mounted all by itself,it is flat,and has a 3 inch flat plug connected to it,the est module is most likely built into the module on this module,how many pins does the ignition module have?

this is the module,it is mounted somewhere on the fire wall or on a bracket near the valve cover on passengers side,but the ignition module also has a by pass for this in the distributor,it could be either one of the parts that are bad. this is the module,it is mounted somewhere on the fire wall or on a bracket near the valve cover on passengers side,but the ignition module also has a by pass for this in the distributor,it could be either one of the parts that are bad.

This est module is the advance of the timing,this is what gives the engine power,so yes this is the problem,but it can be the ignition module also,they work together,the ignition module has the by pass in it,it may not be working,or it can be the est module,napa can test the module for you to make sure before you order the est module,I have replaced about 10 est modules in my life,and only one of them was the problem,it ended up being the ignition module on most of them,and the others it was the ignition module,and the pick up coil in the distributor. This est module is the advance of the timing,this is what gives the engine power,so yes this is the problem,but it can be the ignition module also,they work together,the ignition module has the by pass in it,it may not be working,or it can be the est module,napa can test the module for you to make sure before you order the est module,I have replaced about 10 est modules in my life,and only one of them was the problem,it ended up being the ignition module on most of them,and the others it was the ignition module,and the pick up coil in the distributor.

Did you get the picture of the est module? Did you get the picture of the est module?

Sometimes the computer will have to notice the problem a lot of times to set the code,but If I was any help,please let them know,thank you,just follow the directions on the page,Thank you and You have a good knowledge of automotive,you will get her going,I am sure the est module will solve the problem for you. Sometimes the computer will have to notice the problem a lot of times to set the code,but If I was any help,please let them know,thank you,just follow the directions on the page,Thank you and You have a good knowledge of automotive,you will get her going,I am sure the est module will solve the problem for you.

If it is not done,it will accept on it`s own in 7 days. If it is not done,it will accept on it`s own in 7 days.

Thank you,and use us again. Thank you,and use us again.

You have already pressed accepted thank you. You have already pressed accepted thank you.