Stumbling problem

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asmallsol

Super Moderator
On my swap, I have put about 700 miles on it and have worked out most of the major problems. Most of the time, it pulls hard, however ever once in a while, when I go to accelerate it stubles and feels like there is zero power but with very small spikes in power.

My main realy was bad, however, I resoldered where a solder joint was cracked. Timing has been set correctly.

I am thinking that it may be something with fuel. has anyone else had a problem like this.
 
Ignition? Is it misfiring? Is it sputterning, or just losing power?

I'd check the cap/rotor/timing and also all the grounds.
 
check fuel pressure and do we have any cels?

i just got my p28 rechipped, and there isnt even a hint that i am lacking power now...its wonderful. I was checking for a similar problem forever. I put in a FPR and made sure i was at 40psi. That made the problem occur less often. Then i bought new plugs, wires, rotor and cap, and that also helped a bit. The only thing i can think of is the ecu you are using is just retarding your timing or the map is fucked (like mine).
 
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