<div>Speaking of fuel pressure problems...</div> <div>ok, so I've had this hesitation problem for a while in my '93. Had to replace several things to get the old girl to pass emissions. After replacing EGR/BPT it got somewhat better. After having the dealer do a decarbon service, throttle body cleaning and me re-installing the stock intake the hesitation got MUCH worse.</div> <div> </div> <div>There are two scenarios when it appears.</div> <div>1. Driving on the freeway - cruising at 70ish in 5th 3300 rpm - almost exactly every minute it starts to stumble, like the car is coughing....cough, cough, cough...for about 3-4 seconds, then it stops. 1 minute later...cough, cough, cough...stops... No noise when it does this, just cuts in and out. It will do this regularly all the way home. Doesn't matter if the A/C is on or off.</div> <div> </div> <div>2. Under pretty heavy
acceleration...usually in 4th gear - like when entering the freeway - around 4K rpm with about 85% throttle it feels suddenly like I"ve hit a brick wall - BAD stumble...like the car is choking. It will stop if I give it full throttle for a few seconds.</div> <div>I can re-create the situation by downshifting from 5th to 4th and giving it more throttle, I'll accelerate up till I hit the 4K rpm mark, then it stumbles again. If I just keep the throttle at the same spot around 85% in 4th the car will actually begin to lose speed, it accelerates up to that then starts slowing down even though the rpms still read 4K.</div> <div> </div> <div>I am thinking it may be a fuel pressure problem or maybe ignition problem? Could this be the MAF ground problem?</div> <div> </div> <div>What's so wierd is how predictable it is. When it does the stumble while cruising you can almost set your watch by it, its so regular.</div> <div> </div>
<div>HELP!</div> <div> </div> <div>Thanks</div> <div>Jason Puckett</div> <div>'93 Ruby Pearl SE-R</div> <div>'91 Super White Maxima</div> <div> </div><p> 
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