Problem engine: Toyota Regius, Dec 1999. 2.7 petrol (converted to LPG 2009). Km 226000. Engine starts well, but requires continuous high revs until warm, low revs and engine cuts out. When at running temperature it preforms as normal. Local garage unable to find cure. Did try replacing accelerator housing, but to no avail. Are there any engines that could possibly be used to replace it without major frame alterations? Have any members any suggestions or solutions, please. David.