Well, I did change a lot of parts (spark plugs, wires, etc.).

But when in neutral, if I accelerate by moving fast the little throttle lever in the engine bay, there is a significant lag.

like if the engine was breathing too much air and couldn’t stand it.

after a second of acceleration, it is ok.


any advise to troubleshoot the problem ?

thanks

 

Did you change the fuel filter and how is your fuel pressure ?

 

Fuel filter is 1 year old. As well as the fuel pump. The issue was already there before.

I ordered a fuel pressure gauge. But there is not the right adapter

 

Test the throttle position sensor (the flat connector, as I see you're got a 87 which would have a second output for the trans computer). If that's bad, the engine computer won't detect that you're snapping the throttle open and dump in extra fuel to compensate.

 

You could have a bad TPS sensor ?