2000 4.0 sohc code 1121

[hudson owner]

My 2000 is throwing code 1121 and bogs down when driving I let off gas and it takes back off. Ive put plugs,wires upper and lower intake gasket, checked for vacuum leaks and all hoses. What am I missing

 

[koda2000]

See if this link helps.

have code P1121

 

[hudson owner]

i used my volt meter and checked the tps.it showe fine, but does it mean it could be bad anyway.

 

[koda2000]

It's saying that your throttle position sensor (TPS) and your mass air-flow sensor (MAF) sensors are not functioning in coordination, which they must do and report their readings back to the PCM. Either could be bad or perhaps their electrical connections/wires are not making a good contact.

As you've just done a bunch of work on your engine you may have forgotten to reconnect something or disturbed a connection.

 

[hudson owner]

I will double check everything Monday. Thanks for the reply, but should i replce doth of them or just the tps?

 

[koda2000]

I will double check everything Monday. Thanks for the reply, but should i replce doth of them or just the tps?

I won't replace either of them w/out testing them first. You didn't have the TDC before doing the repairs you made, correct?

 

[hudson owner]

Yes i had the codes before the repairs. Thats why I done the repairs. I tested them both and they are good. Even replaced the MAF and TPS with known good ones and still get the codes. Any help