BigCol

I had a similar issue and it was a spark plug that was intermittentantly faulty. It's a fairly easy thing to try after checking the PTU connections.

Stock 89 front bar with Stillen GTZ lip spoiler:

Nah I got a paint shop to fit it as I wanted the paint to match properly. But the stillen ones are simple to fit. They just slip on over the standard fascia and are stuck there with urethane glue. Here's a pic of the raw lip just sitting on the car during test fit prior to gluing and painting...

The Stillen III seems to be very popular in the US but I guess it comes down to personal choice....

Here's a pic from sunny Australia :D I bought a GTZ non-turbo lip towards the end of last year. The genuine Stillen ones are a great fit - I'm stoked with the result. Here's a pic: For the full read of my 'facelift' thread Click Me!

I used a HP H5550 ipaq, but others here in oz have used H6515's and h2200's. As newkleer says just don't get a 1900 series unless it is the 1940 which does have serial connection. Here is my install...CLICK HERE TO GO TO AUS300ZX.COM

Not Conzult, but a piece of software called ECUTalk runs on laptops & PDA's (windows mobile ones only). It is developed by a guy here in Oz. Check http://www.ecutalk.com for more info. I bought an old HP ipaq just to run this software and it is absolutely awesome! I don't know how I lived without it.