Mate of mine that doesn't do Internet has an issue with his fj62. Its a dual fuel which has has been running sweet on both. Weve recently done some work to her, guard swaps speedo cable change few other bits and pieces. Now when its on gas runs sweet as usual but petrol has gone queer. At 2000 rpm it kinda surges, drops revs down to 1400 ish then back up, over 2k its fine, under its fine. Just wondering what we mightve done or any tips ideas.
Thanks in advance
Thanks in advance